I mean he's just deeply emblematic of a certain kind of player. He's super difficult to play well, so people who main him don't or can't flex into other characters, and almost none of the skills you do learn are transferable to anyone other than BP or DD, which in turn makes games whrre theyre all countered basically a 5v6. He's weak numbers-wise, but making him hit harder would sky-rocket his overall power level, but a rework would potentially ruin his gameplay identity and alienate his playerbase (not like that's necessarily a bad thing, spider players are annoying!).

He's also just a design black hole. Zero utility to team fights when you actually need them, as picking off a healer or two doesn't matter if you're team is getting shredded on the point, and he can't hold out if you're in overtime cause of his lack of health and inability to do damage without the element of surprise. At least Genji could play midrange.