I think we underestimate the amount of good looks Harden is gonna create for the team, more specifically Embiid. Without Ben for the last half a year we've kinda become accustomed to Joel just grabbing the board and taking it up himself but now James will be able to provide alot pressure on the defense with drives that allow for easy weak side lobs/dumpins for Joel.
Although Ben was an elite creator with his passing he was always scared of getting fouled and didn't wanna attack the basket because of it so he would usually stop his dribble in the paint and take those awkward turnaround floaters instead of taking it all the way. This also caused the log jam downlow where he would get in Joel's way.