It's bizarre that you'd pay $3000 more over the Mac Studio for zero extra performance, upgradability only for storage, and a bunch of useless PCI slots that don't support GPUs.
Likewise if you're in a studio being able to reduce the amount of equipment in your rack is always a win.
Maybe those cards will trickle out over time, but not having them ready at launch makes the Pro feel like an afterthought right now.