There's also the thing that marriage isn't really seen as "you have to do this" kind of deal, well, not as much at least.
I'm honestly not sure what the problem is with them being white.
Black Panther.Yes, Future Foundation can possibly introduce new diverse heroes, but did it? Spider-Man introduced Miles, and Iron Man introduced War Machine and Ironheart. How much did F4 add?
It also took Spider-Man a really, really long time to introduce Miles lol.