Miles really wasn't the best example for what I'm talking about, but still.  In terms of the details of their personal lives, yes, Miles is very distinct from Peter (honestly, he's the best of the legacy characters IMO).  In terms of the broad strokes and the purpose they serve to the story-- quirky/nerdy put-upon everyman, handles mostly street-to-city-level villains, frequently teams up with other heroes as a sort of 'tour guide' to the Marvel universe-- Miles is so similar to Peter that they had to change Peter and make him a globe-trotting billionaire CEO to make room.  It worked a lot better in Ultimate where Pete was already gone, but in 616 it's redundant (like that period in DC where they had Barry and Wally running around at the same time as the Flash, or Bruce and Dick both being Batman at the same time).

Apologies in advance for moving the goal posts, but while Miles does have his own identity out-of-costume, in-costume and out-of-universe he pretty much exists just to be "the new Spider-Man," and trades primarily on co-opting Peter Parker's alias, look, powers, and brand value.  It's not as severe as, say, Kate Bishop constantly going "screw Clint Barton, [i]I'm[/i] Hawkeye," but you can't really write Parker out of Miles's story without it collapsing on itself.  It doesn't necessarily take a lot of futzing around with the backstory to make Kamala Khan's story work without Danvers, since their origins and powers and lineup of villains are very different and they really only share a name.  You can't really do that with Miles, not without turning it into essentially a reboot of Peter-- at which point, why not just use Peter?


At any rate, we're getting off-track from the game itself, especially since I've already broken my "no legacy characters" rule by approving White Tiger.