I can see why they’d decide to go in-package with their memory, it is really very fast. And 192GB of memory is not a huge amount of memory in server/HPC land, but it is still a decent chunk of space. You could load up a Mac Pro with a bunch of PCIe nvme drives or something, I wonder if it would really be that hard to adapt to that.
I certainly wouldn’t turn down the chance to try, haha.
That said, it isn't the bet I'd make if I was tasked with purchasing for a company. I'd get the studios in a reasonably high config and then sell them every 2-3 years and replace with newer model. You'd pass the pro's in perf pretty readily from CPU bumps alone and likely recoupe a lot of your investment.
Let’s lie to OS and tell it that this memory is actually a disk. Then, it will lie to the programs, and tell them that that disk is actually memory.
That said, up to now it's probably provided me with ~ fastest possible drive speeds available for macOS. For business/dev purposes, I really can't complain (except about price & lack of modern Nvidia support - but alas), even though I'm already using M1 Max these days - the single-core speed is just too good.