This basically undoes the only logical reason to undo the marriage. Black Cat only worked because she had developed differently to MJ but thing is both have a sense of fun and responsibility. The odd rivalry only worked because Felicia had grown up to accept the Man behind the Mask.
MJ and Felicia had different attitudes. while both became more responsible, MJ wants Peter to take more responsibility with the relationship, while Felicia wants Peter to have a bit more fun- It'll be good for him. They both have points. A relationship with MJ as was is logically harder than that with the Felicia she had developed into.
But the marriage stopped Felicia from ever being a real competitor and they thought divorce would age Peter. Then of course they undo good work on all three characters. Because instead of saying basic incompatibilties or grown apart they give Peter a mid life crisis. Divorces happen even when young. A mid life crisis not so much.
Should the marriage have been done in the firt place? Perhaps not. But it certainly shouldn't have been undone like this.