I understand that these FlexATX PSU:s are mostly used for servers, but it seems a very consumer friendly one could be produced for mini-itx systems, in theory.
Let's say:
300W (fanless, "platinum" rating components, heatsinks, perforated casing, modular, 24pin motherboard, 4+4pin CPU, 6+2pin GPU.
Impossible? At least the FSP FlexGURU is a step in the right direction with regards to looks.