You must be unaware that System76 was already selling 192GB machines, mac studios used to be 512GB max. The only reason why we don’t have them anymore is that we are in RAM shortage.
Those 192GB aren't unified memory though. 128GB on Mac or 395 can be used by both CPU and GPU. It's the GPU + large memory that opens up fast local LLM inteference.
Yeah, those aren’t. But if we had the ability to buy that much RAM in the laptop then everyone would be looking in that direction. Until this thing discussed here comes to the market, “we didn’t have computers with unified 128GB RAM either” (except of macs).