Too many killers to keep the game healthy.
Each new patch is a wave of bugs striking certain Killers. The 3.7.0 patch have ruined the Hillbilly and Leatherface, spoiled the Wraith, affected the Nurse so she is AGAIN unable to blink properly in some maps, made Huntress Status Effect addons useless.
Maybe it is a sign to stop making DLC's? It seems to be already extremely hard to monitor every Killer before releasing New patches. Also, many of new Killers are not that nicely designed or unique, Deathslinger is terrible, Demogorgon is Meh, Plague is sick..