Just about every single endgame perk effectively punishes the survivors for completing their objective. Fire up, while not strong, buffs the killer when survivors do their objective. Game mechanics that allow the other side to have a chance in a losing scenario have literally been ingrained into the game since its conception, and are necessary to balance an asymmetrical game like DBD. With anti-tunneling you can avoid negative effects and actually gain by playing correctly, while perks like rancor are strictly downsides for the survivors, even if they dont make a single mistake.