Why do People Hate on Crossbow Expert?

[pwykersotz]

Notice the part I bolded. If you're changing the rules, not adding to but changing them, just to suit your ideas of real world physics, then you're not playing D&D.

That has implications far beyond the thread as I've read it so far (and little to do with Xetheral's point). Are you suggesting that I'm not playing D&D if I rule that a fall from over 400' is instant death and that crossbows can only ever fire once before breaking? Or are you hyperbolizing the specifics of accepting that trying to make a combat system that never strains physics is improbable?