Because it’s a multiplayer game and it’s annoying when bugged classes/builds trivialize all the content when you’re around them. Do I have a choice not to see other players? No, I don’t. Second, I hate powercreep and how it trivializes all content even when I play in dungeons, completely solo. So yeah, the insistence of not nerfing and not balancing the game in fact affects the way I play the game.
I think many players are hungry for some challenge in the ARPG genre as well, which POE2 hopefully will deliver. I don’t understand why D4 is not allowed by players like you to have any challenge whatsoever.