This is just my opinion.
For now both parties are better off together despite not being on the best of terms. That may change as the season progresses. While Ben Simmons has a lucrative 4 years left, I think going to a losing team which has no shot at a title should make him want to stay in Philly. He would have to wait 4 years to get to a team of his choice and still would need to prove himself over that time.
The Sixers should not “give away” Simmons for a low volume transaction. Winning may help heal some of the wounds. When Embiid will sit, it still will be Simmons team combined now with Maxey and Milton. Simmons still has a change to shine in Philly.
A breakup make be the easy way to go but likely hurts both parties !