I think Epic could get Unreal to run just fine. Unfortunately they don’t have a great relationship with Apple (I can’t remember why but I think it was something Apple did).

The Mac Pro makes sense for only a few true professionals who need those PCI slots for non-GPU things. But those people are have BIG budgets to spend and are good customers.

Maybe the future Pros will improve, this one is a bit odd. But it has a purpose for those who truly need it.