Ben Simmons has picked up Trae Young.
These days, nobody really cares about using a stopper on a star player, especially if you got someone as good as Thybulle on defense. Thybulle in my opinion, is a better, more disruptive defender than Simmons. Simmons is more versatile because he's bigger.
When Deandre Hunter comes back, Ben is going to be guarding him.
And honestly, if Doc was smart, he would play Embiid-less lineups more often, with Simmons, Collins, Harris, Maxey and Steph and just switch on Trae instead of double teaming. Trae isn't Steph Curry. Trae can beat double teams.