I will say this for Simmons. The Sixers sucked and got Embiid and were better, yes, but still sucked. Then Simmons joined the team and they were an instant playoff team that reached the second round. They won the last 16 games of that season with Embiid not playing for most of them (eye injury). Also- last year, there was a game against the Brooklyn Nets that Embiid missed and Simmons went OFF.
https://www.basketball-reference.com/boxscores/201904180BRK.html
If you surround Simmons with shooters like Ilyasova/Belinelli or Redick/Harris, you will win a lot of games, even without Embiid. Maybe especially without Embiid.