OEMs have been using their own exclusively 12V power supplies (and custom motherboards with power planes) for years. Fujitsu, Lenovo, Dell and others all have models that ship with power supplies which lack the other rails, with lower voltage conversion for things like SATA power being done on...
Given that ASMedia will also be producing the next generation X670 chipsets, the fact that they're unable to remain on track with the B550 chipset is slightly concerning.
My beastly i7-2600K. Pure, raw, concentrated kickass in a can. Wolfenstein (1991)? Crushes it. DOOM (1993)? Rip 'n tear!
Cinebench R20 multithread? Uh... hey, what's that ove- <ruuuuns>