That Corsair AX1200i is sure built well, it's not your run-of-the mill typical PC PSU, that's for sure, but $350
I see how they have put the 3.3V rails, 5VSB rails on risers, they can probably build different versions using different risers.
Pardon the curmudgeonish reaction here... but why do we even need to "innovate" with freaking power supplies?
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Don't the engineers have something better to do?
They need to innovate in order to drive sales. Features drive sales. They need to keep adding features or else there's no reason to buy a new PSU, or the best PSU, top of the line, etc... There's always going to be some kiddy who wants this, and is excited by being able to chart their 12V and 5V rails over time...
Future features will likely include battery inputs (you
can run the PSU directly off two 12V SLA batteries, just insert them into the circuit after the boost stage. During a power failure the DC bus drops from 400VDC to 24VDC --- as long as the system is designed for the two different DC bus voltages, everything will be fine)