Given Apple’s current locked-down trajectory with the Mac, the Mac Pro was gonna die eventually, and it’s for the best that it does given it was reduced to little more than a massively overpriced Mac Studio grafted onto a useless PCIe backplane; a $12k grift, basically.
PCs at least are still modular and expandable; for now.
They’re overpriced crap now. You buy at a 3x premium for the hardware, and you get the OS. That’s it.
But it all lives in a big cheese grater