I'm pretty happy with this trade. I would have preferred something with Sac involving Haliburton, which could have given the Sixers a great young backcourt going forward, but there's no doubt that this puts the Sixers firmly in the title conversation. Embiid + Harden has enormous potential. Harden will lessen the pressure on Harris, he's probably better suited as a 3rd option than a 2nd. It will also relieve some of the pressure on Maxey since Harden will surely be running the offense in at least some rotations.
Not crazy about the additional pieces (players and picks) that Morey gave up but most likely none of them are that important, all things considered. And not giving up either Maxey or Thybulle is huge. Also Harden opting in for next season helps the Sixers. So all in all, good deal. And good deal for the Nets too, that is a situation (playing with KD, Irving, and Harris) where he can potentially thrive.