The current “Tash Can” Mac Pro is not really upgradable. It has proprietary GPU and SSD interfaces and no other PCI slots. You might be able to purchase a repl

The current “Tash Can” Mac Pro is not really upgradable. It has proprietary GPU and SSD interfaces and no other PCI slots. You might be able to purchase a replacement SSD for someone like OWC or upgrade to the higher spec Apple sourced GPU if you bought a low end model but Apple is not expecting you to do this. You can update the RAM or use external thunderbolt peripherals but that’s a long way from the older “cheese grater” Mac Pro. If I was to guess I would say that this deliberate removal of upgrade path is actually about design for reliability. If you remove the upgrades you remove the chance of static damage or use of faulty parts. Also the case is easier to manufacture and more robust because it’s less complex. I think that’s the real reason the SSD is now soldered in the current MacBook Pro but it’s just a guess.