Eruption Nerf kinda reminds me of the old DBD Balance

How highly the perk affects kill rates should affect the decision to nerf it, but doesn't necessarily dictates how hard the perk needs to be nerfed. At the point you nerf a perk, a reduction of its results in data is already expected, so how can you know nerfing it for a certain amount won't be enough? Also, they nerfed it so much they made it clearly worse than its old version (the one that was so bad it needed to be buffed according they're own data) and other regression perks that aren't that good today, like Jolt (which got buffed multiple times) and Pop Goes the Weasel.

Nurse's Purple Range add-on wasn't her best add-on at all. Her multiple blink add-ons were, and they got nerfed a long time ago. If you see when the community started complaining a lot about the purple range add-on specifically, it was far more recent.

Moris were still nerfed almost a year before keys did. Also, don't forget they used to be even stronger in 2016 but had gotten nerfed a long time ago.

It's still questionable what are the nerfs the Blight needs, but multiple killers the survivors complained about have been nerfed in the meantime: Spirit (twice), Deathslinger, Nurse.

When Legion first came out, survivors got buffs just because this new killer existed. The deep wound mechanic was put into Borrowerd Time and made it must stronger than it used to be, even though it was considered a fine perk at the time (since the game was way more survivor-sided back then). The Legion was only not changed early because they needed a full rework, but it only took months, they STILL got reworked before Freddy, for whom the community was asking for buffs A YEAR before the Legion even came out. Again, Freddy was nerfed to the ground IN HIS FIRST PATCH.

In Legion's rework, the deep wound changes buffed BT even further, something that wasn't even requested, and the Pig was nerfed alongside them.

A lot of your examples are from things there were far from being that much complained about in the past, while the devs were nerfing other killer stuff that raised more complaints, like old bloodlust, Freddy, other killers that got nerfed and some specific iri add-ons that were quite disliked.

But if there's any doubt the devs listened far more to survivors than killer back in 2018, you know the famous "play something else" line? That wasn't the only time a killer request got dismissed. The same game director once read comments about survivors being overpowered in Dead by Daylight's stream #114, in november 2018, right after a Halloween event where survivors were just farming nectar instead of doing gens and then killing themselves on hook. He then interrupted what the other devs were saying to call attention to those comments, answered by outright dismissing them, insinuating survivors had a harder time based on INDIVIDUAL SURVIVAL RATES. Kill rates, which are based on the amount of deaths per match, weren't shown in that stream, nor were matches with different killers considered. For some reason, the only data considering different killers was "mori rate" (really low because moris were used quite rarely). Despite that, he treated the data as "hard facts", asked "have you not been following" to the commenters and while saying survivors died most of the matches, even laughed a little.

And if anyone still thinks that data was really that reliable, kill rates were shown again a few months later, after the DS rework and some others, and they were actually higher this time.

I don't remember ever seeing a dev answering survivor requests or complaints by saying "you're wrong, the other side has more trouble than you, have you not been following?" and laughing about it. So yeah, hard to believe they listened equally to both sides at the time.

Again, I do believe this has become more fair over the years, I just think today there might still be some double standard while back in the day it felt obvious.

But it took years for any change that made him better, while making him much worse only took one patch.

Except that the new info it provides is useless most of the time and we already have perks that do that better, as I stated above. In general, it was reduced from one of the best killer perks to a useless one that isn't even worth bringing.

Nurse remained the best because her power is better to counter survivors by default, it covers the distance between you and the survivor and it goes right through the objects protecting them from your approach. Still, she was nerfed many times through the years.

Survivors might not have gotten exactly some perfect attention from the devs in the past, but they still got way faster and better reactions and responses than killers. Every major perk nerf had to go through some careful planning and testing to still be useful after a nerf, and most of them took years to even be changed. Killer perks got nerfed before they even went live (Surge/Jolt is a good example of that) while even Mettle of Man went live untouched for some reason. Killers had requested changes outright denied, like gen speed nerf, while some survivor requested changes were discussed on the streams even if they weren't in the current plan. Hell, even the first reworked map was Badham (sure, it got changes when Freddy got reworked, but later it got a full rework, before any other map), which was one of the statistically worse ones for survivors, and it actually became a greatly survivor-sided map, while Haddonfield wasn't reworked for years, Red Forest STILL didn't have its size reduced, and when Fractured Cowshed, Gas Haven and other survivor-sided maps were finally reworked, they remained good for survivors. Hell, Cowshed is actually worse now than it was before its rework.