To me, the problem really comes down to his origin story. If you see Spider-Man as a guy who got a bunch of powers, then retrofitted them into a spider theme, mechanical makes sense. He'd need webs for the theme. But if you see him as a guy who got bit by a radioactive spider, got spider powers, but bizarrely didn't get the ability to do the one thing spiders are most known for, but also by complete coincidence happens to be specifically a genius at mechanically replicating webs, entirely independent of his run in with a spider... That's kinda dumb. It makes sense to prefer biological when you look at it like that.
And the thing about webs coming from his butt is dumb if you're willing to accept that the spider gave him clairvoyance and wall climbing abilities that work through shoes.
And the thing about webs coming from his butt is dumb if you're willing to accept that the spider gave him clairvoyance and wall climbing abilities that work through shoes.