Killers are making the wrong argument
We hear over and over again how imbalanced DBD is. Most people would agree that the game is indeed imbalanced and in need of adjustments. As we have seen with some of the recent "experiments", it is possible for killer to do well at high MMR. The problem is, and what killers are not saying, is that the tactics required to do well at high MMR are not fun. Against good survivors, the killer essentially has no choice but to tunnel and camp to make the game winnable. Camping the hook requires no gameplay from killer, and limits the options survivors have to save; the hooked survivor is obviously miserable as well.
Data: The devs and community continually cite statistics to prove how balanced the game is. The obvious major flaw with this approach is that data cannot tell you everything. A tactic/sweat squad can be beatable, while at the same time not being fun to fight. This isn't surprising, since many aspects of society are increasingly relying on statistics (the NFL, fighting game balance, analytics, etc...). In my opinion, everyone on here, needs to be arguing about high level play is unfun, not that it is imbalanced. Hopefully this will inspire the devs to change things up.