I think Morey (correctly) realizes that a team centered around Harden wasn't going to win with defense, so they loaded up with offense.

Philly is currently the 13th best offense in the NBA. And they don't shoot a lot of 3s. (These things are probably related.) So I think if Morey's going to sacrifice defense-- and, in dealing Simmons, that's almost certainly going to be the case-- he probably won't do it for a player like Fox, who doesn't stretch the floor as a shooter. This is the weird part about building your team around a center in today's NBA-- it rules out a lot of potential talent you could take on, because you need to leave the middle of the floor as open as possible.

(It's also underscores how great a job Denver has done, saying, "Cool, we've got Jokic, let's have four guys spacing the floor around him at basically all times on offense." Meanwhile, Philly has Simmons, who can't shoot, Harris, who prefers to operate in the midrange, and Embiid, a true big, on the floor at the same time a lot. And they drafted Thybulle, who can't shoot. And Maxey, an awesome scorer, but not a distance shooter.)