Last second switching and why it's a problem.

Odds are if you've played killer for long enough you're likely aware of what last second switching is. For those that somehow don't, this has to do with how the lobbies are designed. 4 survivors connect to the killer's lobby and allows the killer to select perks based off of the information provided to them as the countdown starts, often times all but one survivor will ready up and the moment the killer hits 'ready' or as the countdown reaches roughly 6 seconds 1 or more players switch into a different loadout often containing flashlights, toolboxes, instahealing medkits or skins people often dodge. People who do this when asked often do it so the killer does not equip lightborn, franklin's demise and any other character or perk that would make their item pointless or because they contain a skin they often get dodged for (such as legacy). Though one thing I tend to see go hand to hand with last second switching is extreme levels of toxicity as well which often includes childish behavior such as applying a macro to flashlights to cause very annoying sounds, t-bagging (may or may not be annoying to the killer, case by case basis) and in general leads to very poor behavior on both sides of the game creating a very unfun environment.

Why is this a problem? This is because part of the game as a killer means you're spending time to prepare for specific survivors and items. For instance if you see a Jake, you might want to run bloodhound or hangman's trick as a basic example, or if you see a flashlight you may want to equip lightborn, overwhelming presence or franklin's demise, if you see a medkit you might want to run sloppy butcher, overwhelming presence, franklin's demise, coulrophobia or any other perk related to slowing down healing speed or removing items. By allowing last second switching to happen, it cuts out a feature of the game intended to allow you as the killer to prepare against the survivors and is a tool survivors use to cheese out the system instead of learning to adapt to perks that are not even frequently used to begin with.
Players often complain that if this was fixed that killers would dodge them for having a skin (such as exclusives, legacy, prestige, etc) which is often a very silly reason to be dodged which I agree with, however this does not excuse the fact that this can be done in the game either. Often times the same people who last second switch from my experience are also the same exact people who use lower rank survivors as an attempt to bully lower rank killers rather than genuinely wanting to use the skin alone.

What I would propose is that after 40 seconds survivors are no longer able to change their loadouts and that killers are granted the remaining 20 seconds (without being locked out) to change their loadouts appropriately without the risk of having perks being rendered entirely useless or being forced to D/C or handle a very miserable game. As it stands, there is absolutely no valid reason why the lobby should be continued to be exploited as an attempt to ruin the day of other players and negating a feature entirely. If people want to run perks light lightborn, tough and better luck next time as items are not a requirement to win to begin with but rather a luxury to the game instead.