I assume the audience is the Disneys/Pixars of the world, and the people making ads, etc in 8K. They presumably need that I/O. For them the absurdly expensive

I assume the audience is the Disneys/Pixars of the world, and the people making ads, etc in 8K. They presumably need that I/O. For them the absurdly expensive monitor is a rounding error, and the extra local disk is worth it over running over a SAN. Perhaps also some computationally adjacent applications like CFD or weather prediction. I struggle to think of anyone else with such an application. There are applications that could benefit from the features but it wouldn’t be cost effective (e.g. something more systolic where it’s better to rent cloud service, even if it were nominally slower, because once you’re done you don’t have the hardware lying around).