After Eight-
A late point of attack for this show is not a bad idea- everyone knows the origin of Spider-Man, for god's sake. We don't need to know his origin story. Again. But your suggestion is just unwise playwriting. Urinetown put it well: "Too Much Exposition". All telling and no showing is just as boring as all showing and no telling. And such an exposition-heavy scene would be so obvious, heavy-handed, and boring.
A smarter production team would've had the story start with Spider-Man already created and done something from there. Spider-Man 2 was the most successful of the films because we didn't spend half the film establishing who the hell Spider-Man is or why he is. We got a little exposition about Doc Ock and then a very strong film with strong character arcs. There is no reason why the musical couldn't have done that, aside from Taymor wanting to put her mark on the whole Spider-Man mythos.
It's clear they are just taking what Taymor created it, doing some pruning and some remolding and then calling it art. But at it's heart, it sounds like this thing is mostly the same, now instead of being bizarre, crazy, bad, and kinda boring, it's now just boring.
If they want to make a Spider-Man musical that works, they're gonna need to scrap it and start anew, which is just completely unfeasible.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."