I posted these thoughts on a different thread, which seems to have got deleted. So I'm reposting.
Mary Jane is a character who has pretty much always been written as a rounded character by writers who want her to be a love interest for Peter and has pretty much always been flanderised and flattened by writers who don't want her to be a love interest.
I've said before (and will say again) that Mary Jane was Stan Lee's one success at writing a young female character. And what is particularly successful is that she is both obviously attracted to Peter and that does not dominate her character. Later on when Lee made Gwen the love interest he wrote MJ as a shallow party girl.
In the eighties Mary Jane's character arc was learning to overcome the fear of commitment created in her by her abusive father and learning that she could trust and rely on Peter and that he could trust and rely on her.
It's unusual for a female character to be more well-rounded when written as the love interest for a male protagonist.
But it's important that it is done. Because real people fall in love and have real relationships, and so writing rounded relationships between two characters who are both rounded is good for representation of rounded relationships.
And that is why it is better for MJ as a character to be with Peter.
People advocating that MJ is better off as not the love interest are ignoring the history of her character. In universe, her character development is learning that she can commit to Peter. Out of universe, writers who want her to not be the love interest have hardly ever written her as a rounded character. Saying that she's better off as a result of this run, which has shown no interest in her interiority or in any aspect of her established character that's not relevant to being separated from Peter, is pretty much calling white black.