[OkayPhysicist]

The issue from the manufacturer's perspective is that they've got two different customer bases with wildly different willingness to pay, but not substantially different needs from their product. If Nvidia and AMD didn't split the two markets somehow, then there would be no cards available to the PC market, since the AI companies with much deeper pockets would buy up the lot. This is undesirable from the manufacturer's perspective for a couple reasons, but I suspect a big one is worries that the next AI winter would cause their entire business to crater out, whereas the PC market is pretty reliable for the foreseeable future.

Right now, the best discriminator they have is that PC users are willing to put up with much smaller amounts of VRAM.