I'd say they are more like the Cowboys. They have talent, and have not been completely without success (division titles and some playoff success) but the incompetence gives it a ceiling, and they either make the wrong hires or good hires have no chance under this ownership (an ownership group, which, incidentally, was in New Orleans watching the Super Bowl - and not because they are Eagles fans like Middleton - and attending a Fanatics party, not in Milwaukee with the Sixers). And then what we see as bad luck is really just built in to the kind of teams and players they've had. Also, Joel=Dak.
But the Devils are good and the Commanders look poised to thrive. The Sixers problem has always been that ownership was too hands-on so instead of worrying that Harris loves his football team more we should only hope so.