I'm going to push back on this.
First of all, YES, people need more than one friend. It's not wise or smart or healthy to wrap your entire world up in another person. Peter and MJ are best friends and know each other the best out of anyone else in their worlds, but YES they both need additional friends (gonna point out Peter's friend status is also pitifully weak these days. When the person you seem to talk to the most is the murderer of your first love, your life is truly in dire straits).
Second, MJ does have friends. But the book is not called The Amazing Mary Jane (really wish we had got gotten the additional issues we were promised). Therefore, we're going to see her go off to work and only reference her friends/co-workers, and we might even see a quick scene such as when MJ talked to her friends about opening up a modeling agency but they convinced her she should audition for Secret Hospital instead, or MJ bringing home a friend only for Peter to be there anticipating a romantic night much to his embarassment, or MJ hanging out with Jill Stacy or Carlie Cooper. But that doesn't mean she doesn't have an active social life off panel and doesn't have a full contact list in her phone of people to go dancing with when she feels like it.
Lois Lane shares a social/work world with Clark, which is why we see Lois at work. It's why we also know Betty Brant's co-workers, because they are Peter's. Make Peter an actor, and he and MJ would also share the same circle. (Why hasn't there been a Simon Williams/MJ team-up?!)
I wish we had seen more of Spencer's LookUps, which was a really cool concept, and of course MJ had her own, separate career in the pre-OMD issues. And I'd argue MJ and Aunt May also have their own, separate from Peter relationship.
MJ and Peter, when portrayed correctly, have a relationship of equals where they are each other's biggest supports as well as closest confidantes, but they do have other important people in their lives.