And there's nothing "natural" and "just happens" about that level of storytelling. Because there's always a barrier you can't get past because of the status quo's you cannot break. Mary Jane has the benefit of being the character allowed to have that growth. Others aren't so lucky. Not because there isn't talented enough writers to do it, but because they wouldn't be allowed to even if they could. That's the difference.
It goes back to that video I linked above, they say it perfectly.
"Almost
any of Spider-Man's love interests,
could be Chat. They might not have her powers, or her name, or even her personality. But, they don't need that. What really makes Chat stand out...is the
writing. Deciding 'Yeah! Let's have Spider-Man tell his girlfriend about the supervillains he's fighting. Let's have
her actively want to help! Let's have them love the hell out of each other and let's have them be really understanding when the other one makes a mistake or acts imperfectly.'.
Those writing decisions, are what make Chat stand out over the other characters. But they don't
have to, everyone(of those potential love interests) could have those."