Because Xero is about winning, not about fun. Removing several weapons, macros arent allowed but almost everyone uses them(starting with the mouse), tooling, spaming dash and cs(you can see it mostly in dm and br when they realise they dont got skill), people dont get stunned because of a cheat or whatever it is and they can just run around without getting hit. Doesnt feel fun, just people doing everything to do win. Those things also happen when the game fails which you can see in xero pretty well. Alone p2p and whatever is bugged with the hitbox getting hit while not getting hit from even low ms.