The Fact that Decisive Strike get's deactivated in the Endgame is just stupid

You misunderstood the specific conditions part. I was saying the conditions are specific enough to not justify its removal in endgame. The DC equivalent instead would be the Killer refusing to grab out of locker or after downing immediately off-hook. The Killer's denial of the perk in that example is the 'DC initiator', not the game's denial. Just as Deli is specific enough to only work on first hook. DS is anti-tunnel, Deli is self-unhook, Hexes are power at the price of vulnerability.

Also people keep saying 'no counterplay' as if there is only 1 survivor in a match of DBD. There are 3 other Survs, and more often than not, one of them had to get the unhook for the unhooked Surv to even have DS activate instead of dying on hook. Yes 4% Kobe exists, (with a potential Slippery Meat) yes Deli exists, but they are far from the norm (with a theoretical endgame DS). Also Pop and other down/hook based perks are equally 'win more' with 'no counterplay' as Survivors are designed to go down in chase (eventually). They all have counterplay, and there is nothing wrong with any of them being win more. I can't be against any anti-tunnel effects when so little exists in the form of preventing it in the first place. Hope and Devour Hope are far 'worse' in terms of 'win-more' perks, because they aren't addressing design flaws. Now to be clear, I think Hope and Devour Hope are both great, fun, well designed perks. The issue is they make your highs higher, as opposed to preventing lows being made lower. Preventing the worst of experiences is rarely a problem to me, especially when the example of 'no-counterplay' is a Bubba ignoring 2 free downs on different people for the tunnel off-hook instead.

Also its strange you consider the Killer's actions in endgame the Survivor's fault. I wouldn't consider an endgame facecamp an issue, since there are no more objectives to defend other than the hooked survivor. I would consider an endgame tunnel (as much as any state of the game) an issue, because the Killer had more than enough opportunity to grab or otherwise down the would-be unhooking Surv(s). This laser focus on 'must kill the unhooked person' is a strange obsession to me, as it isn't even always the path of least resistance. Even then, if the Killer left the hook, they risked extra kills at the cost of the one they have. They knew what they were signing up for when they did it. They could have simply facecamped in endgame and guarantee 1 (more) kill (assuming they had any before endgame in the first place).

Go for unhooker is counterplay. Quit lying to yourself about 'no counterplay'.

What does facecamping in endgame have to do with chasing mid match? Even then if you were talking about DS mid-match, the Conspicuous Action change more than adequately fixed the problems with the perk prior to it being butchered. I truly don't understand where the conversation swapped from endgame to earlier, but they do have that perk you were wanting. The perk is called Corrupt Intervention, and once you get the down (or after 2 minutes) it goes away. It is a little finicky, since some spawns are strange, but Survs are prevented from doing gens without risking themselves like you asked for.

If you are talking about unable to control other players, as Killer you can always control Survivors. You can corral them to a corner of the map by forcing them to risk a hit otherwise. You can pressure them off gens by chases or hooks. Survivors are largely your puppets, and you force them to risk things in order to gain others. Winning as Killer just involves weighing that risk, and taking the option that best suits your Killer/playstyle/perks/opponents. "I know this Feng has Lithe, so I'll chase this direction to force a wasted sprint burst." Or "I know this Meg will sit on gens regardless of who is on hook, so I'll chase the only other available person to ensure the people on hook don't get rescued." Or "I brought Wesker's Iri exposed and start infected add-on, so I will get some early intel in the form of sprays, so I can pass up Lethal Pursuer."

It more then that, the purpose of DS is to prevent and discouraged tunneling, especially in the beginning of the game. If you are bad survivor whom is poor at chase, or fail to relie on your teammates to do anything productive like gen repairs or taking the heat of the chase or protect you from hits; then this perk is your friend. If you are already successful in your objectives to fix the Generators, and opening the exit gates; the Survivors as a whole have already won. As far as I am concerned with fairness, I think it is perfect fair if the Killer doesn't have to deal with burden of DS being still present when they are crawling away to the exit gates within 60 seconds.

It not like DS prevent survivors from leaving and Entity blocks the gates for the killer. It simply makes it impossible for the killer to stop that one Survivor from getting away, especially when they have no chances to take down another survivor in their place. So, yeah... deal with it. I don't tunnel unless I am certain that opportunity presents themselves. And when there are no gens left, what else are killers is supposed to do by then?!?!

It not like Killer's cannot reset completed Generator by damage it. Or sabotaging the exit gate switch to delay the inevitable escape. DS being deactivate at EGC, is a perfect balance chance; although I do feel the stun time being reduced to 3 instead of 5 seconds is overkill and I would wished they revert that change.

That doesn't make sense at all. You got play by the killer, you wasted your BT protection, your teammates failed to even help you or you made a bad play that got you down before you even exit the gates. The match is not over yet, until you all escape the exit gates and physically end the match right then and there. If there is a chance to the killer outplay you and is able to prevent you from completing your objective. I'm sorry, but you simply lost and just let the killer secure their 1k victory, in that scenario. If your teammates weren't being so scared and left the exit gates, stick around to go for flashlights plays, bodyblocking, and hook sabotaging; they GREAT JOB. Your team is very productive in objective management as well as Protective of you, and now you 4 are teabaging the exit gates and secure the 4 escapes.

You really shouldn't blame the killer for your and your survivors teammates screwed ups, as you have the tools, perks, items to help with all of that; and DS is only perk at one thing. That is to discouraged tunneling at the beginning/middle of the match; not a "Walk out of Exit Gate Free Card", which is one of the major factors as why it is meta before patch 6.1!

If DS still worked in endgame, everyone would run it for a free escape on top of Basekit BT which was one of the reasons why it got nerfed.

Reaching End Game via 5 gen repairs does not equate to an automatic escape for Survivors. If it did, perks like Blood Warden, No Way Out etc wouldn’t exist. End Game builds do exist and are as valid as any other perk build.

-"I don't understand how this change is fair. So the survivors gets punished because the killer wasn't able to spread pressure or hook me before?"

If everyone has DS then the killer is almost guaranteed to get no kills once the gates are powered due to how the unhook mechanic works with base kit BT. How do we know? The devs needed the DS perk nerfed so they would stop giving away multiple escapes when they played.

As it stands quite often it still results in a free escape.

DS got nerfed from being a "guaranteed" escape to the "potential" to escape. You might not agree but it's in a very fair state right now considering M1 killers. The problem is that DBD can't have one rule set for M1's and another rule set for the "a list" and a third rule set for Nurse/Blight.

Fam, 5 wasn't enough against her. Blight either. She would literally need to stand still for 7~8 seconds to get out of her attack radius (roughly 32m)