My greatest fear was that there wouldn’t be enough of an endgame challenge for skilled players, and holy cow, were my fears ever realized. Champion is a joke, don’t play it at all anymore, and legendary isn’t much better. The only real difficulty spike is the number of specials. Bosses are spongier, but that just means they take longer to kill.
The biggest problem is how little health regular enemies have. In VT1’s Cataclysm, there were only a handful of weapons that could 1-shot clan rats, making crowd control and damage dealing two seperate, and important roles. Now, with enough power level, everything other then mid tier chaos infantry dies in one hit from basically any weapon. Hoards are just something to nuke as you move through the level, not a threat that requires teamwork and skilled melee coordination to deal with.
Don’t be afraid to make the top level difficulty actually difficult. Whats the point of all these new abilities, talents, traits, etc, if there is nothing to test them against. It feels like Vermintide 1, but with a bigger stick.