Yeah, and die area isn't exactly going to be given away on a capacity constrained 5nm wafer line. If you can get the wafer starts at all. Performance per dollar is the only metric that matters, and maybe 7nm or even 14nm performs better at the moment.

DRAM, storage, networking, gpus, accelerators, etc are all eating huge chunks of power. CPU's tiny in comparison. Maybe you save 5% across a datacenter using those fancy unicorn wafers.