Simmons is a solid player. Sure, it's horrible for what Fultz was suppose to be but this is real life, good GMing is moving on from a mistake when you have bigger fish to fry! Honestly, sixers have done a great job this season. Already at this position in such a short time. Cred where it's due, they didn't care to keep crying over spoiled milk.
Where are you are getting that Simmons is a solid player? He shoots 36% from the field, 22% from 3 and has a turnover and a half in 20 minutes of playing time. He is literally one of the worst players in the entire league that gets any playing time. His OBpM is -4.9 his BPM is -5.7. Please take back that comment it is hurting my eyes by how wrong it is.
Like I said, when he won't have expectations and can go back to role-player, he will be fine. He's not as bad as he's been in Orlando.
In 2017-18 with SA he played 30 mpg putting up 14/4 on 46% FG/34% from 3.