Not sure I completely get what this MPX stuff REALLY is. The motherboard has these PCI slots, right? PCI GPUs go in there (normally). Yes there are needs to be able to feed a lot of power to run said cards. So what you describe sounds like you put the PCI GPU into the MPX, then that goes into... the PCI slots on the motherboard? What am I missing? So said modules have their own power connectors? Is that in lieu of providing them on the motherboard... as in justifying buying something else. Or does one come with it but ya gotta buy a second f you want >2 GPUs?
Storage... yeah, I get NVMe. I get NVMe going through the PCI bus via adapters into said PIC bus connectors. That SEEMS like it ain't possible here... there seems to be 2 NVMe slots right on the motherboard. SOMEHOW the ones they show look like nothing I have ever seen, so I suspect we're talking you can ONLY get them from the fruit. Which is why the machine is limited to 4T... far as I know, the biggest NVMe is 2T.
So where is swapping in industry standard parts? It kinda sounds like any "expandability" comes from their OWN stuff... as we KNOW the kind of prices they charge for supplying what normally is industry standard stuff (like 600 HDDs that were the same as what was on the market for 200). Kinda seems that "expandability" means BTO.
AND what about the rumored transition to ARM chips away from Intel? COULD it be that one can simply drop an ARM chip to upgrade the CPU? I'd find that kinda hard to believe, but I could also be wrong. Think about kitting out one of these machines for 25-30 grand only to find out 2 years later, it ain't the hottest thing anymore...