Harden is just a normal NBA star. LeBron, Kawhi, Anthony Davis, Westbrook, Paul, Durant, Butler, Paul George. Literally more than half of the 15 best-paid players in the NBA have either forced their way or self-GMed themselves onto a new team at some point. It's the only way you get them.
There definitely seem to be some concerns about Harden's attitude and conditioning - that are pretty much identical to the ones that existed about Joel. Hopefully Harden is not too old - and wants to win badly enough - to change.
And yeah, I think Kyrie is the bad guy here. Doesn't completely excuse Harden dogging it and wanting out so fast, but we would have only gotten Lillard or Beal under the same circumstances, and did get Butler that way. Bottom line, stars are high maintenance, and the Sixers without another star were never going to win a title (unless Ben had become one). If they don't with Harden it will just be a wash.