I guess the play is more so focus on Embiid, they have a lot of talented players like Tobias Harris as well who should constantly attack, but his contribution is still not enough to take over when Embiid is struggling. The problem with the style is that Embiid will eventually gas out in the 4th quarter, and it would be easy for the opposite team to have a run as they have a better team work, and we have seen that during the Hawks vs 76ers series.
Seeing the same scenarios, when Embiid gases out, everything falls with him. If we see how they've played the playoffs against the Hawks. Each time Embiid loses control, the entire team suffers. It's not just because Simmon can't shoot FT but he also mentally affected that the system mostly circling with Embiid.
Just my two cents, I see the rotations are not well balance; they have Howard to give some quality minutes for Embiid; he doesn't need to play that long as they've still got Harris and Curry who can also convert good offenses. They need to maximize all those stars who can contribute after releasing Simmons and whoever replaces him should also be active in helping the entire team and not to keep relying on how Embiid will play the game.