Google thinks 12v suffices for PCs, and they have the purchasing muscle and alpha dog status to move the idea ahead.
I’ll never ever get another chance to say this, but this RBC member and humble techno-serf, in an obscure blog comment elsewhere in December 2005, beat the Google gurus to the punch.
Sometimes you need to master David Hilbert. Occasionally commonsense would be enough – if you can reach an audience.