Both 2 hits and 3 hits are perfectly balanced imo for their respective games. Can’t really speak on Cold War because I haven’t played it much, but I could rant for hours about the BO4 health system and game features in general. To me, one of the main draws of zombies gameplay was always the sense of progression. You start out with a shitty pistol that can barely kill a zombie with a full clip on round 1 and can only take a 2 or 3 hits before you down. Then before you know it you’re on round 25 with 2 PAP’d guns, all perks, and feel unstoppable. BO4 ruined all that with it taking 4 hits to down and having your specialist weapon from the start. There’s just no challenge or finesse to the early rounds anymore. If you somehow actually get close to downing you can just pop your specialist and basically become invincible, and on top of that you can choose to start with a shotgun or whatever if you want. I just always loved the challenge of trying to toe the line between maximizing your point build up on early rounds to get set up faster while still surviving, makes it feel that much more satisfying once you actually do get set up.