I feel like we won't see her again soon just because of how vitriolic her exit from Peter was, if anything whatever set her up with Peter will become...
Experience is definitely more important than age although comparative to Ultimate Peter I feel like 616 Peter progressed as a hero and crime-fighter...
I guess there's a different narrative conceit comparing a younger Spider-Man doing it all on his own versus one getting into it late in the game with...
I just found it kind of funny how MJ says "I haven't seen you this in love in a long time" as if her relationship with Peter basically meant nothing...