Well, I'd argue that if you need a third party software to run the .EXE files for XIV on a Mac correctly, then that still doesn't necessarily mean that the Mac OS system was built first and foremost to run them in the first place.

Unless you're paying $5,000 for an iMac Pro, you're not getting a good graphics card otherwise. Even my own Macbook Pro has two graphics cards built into it, costs me $2,000 from the Apple store, refurbished even, and I wouldn't trust XIV on this thing. You could easily spend that $5,000 on a custom Windows PC and get more bang for your buck, hell, less than that even.