Interesting reading the history of Spidey. Stan Lee reportedly says to Steve Ditko that he wanted a character existing in high school and dealing with everyday problems and hangups which we eventually see. Then Ditko gives him that. Ditko wants to keep him in high school but then Stan does an about face and is like "no, he's going to grow and change and go to college" Ditko disagrees but reluctantly goes for Stan's vision. That right there is the root problem for why we got OMD is Stan's original pitch for the character and then his change to giving him growth. Flash forward to 2007. Joe Quesada probably was recalling that conflict and makes the decision for OMD because of Steve Ditko Since then despite getting some good Spidey material, Peter/MJ fans are still left in the cold. You can still write romantic conflict and triangles with other conflicts even within the marriage. X-Men is famous for this as well as with Sue/Reed/Namor.