Why is it that whenever call of duty introduces an enemy type that is not a zombie, the fandom automatically gets angry?

I'm asking this primarily because of Black ops 4. Black ops 4 gave us werewolves in addition to regular zombies, a freaking undead elephant in IX and a few other enemies types that haven't been seen before. So why is it that whenever something new is brought up, the fandom automatically gets angry?

I would love to for once fight the occasional different enemy. I think werewolves in a zombies map are awesome. I think the fact that fighting a undead elephant would be excellent. Unfortunately we're never going to get it.

I hope you realize that this is a you problem, not the developers.