The Sixers are 4th in the league in assists per game, as great as Bron is his teams rarely move the ball like that. Also, Ben Simmons for the last two weeks has played like a PG, not the current crop of iso-ball PGs, but a dude that will run offense and pass the ball off then make cuts, he's been really impressive in how he can make the pass within the flow of an offense. In terms of their personnel Bron is a terrible fit to play with Ben & Embiid, it would actually kill their spacing and the new continuity/motion offense that they have.
Paul George is a much better fit for the Sixers than LeBron.