Compatible psus for certain processors.....oh God.
So those idiots from Intel didn't only make a new socket and force me to buy a new motherboard, but now they force people to buy new psu?
They aren't forcing people to buy PSUs compatible with a certain processor. They are forcing people to buy PSUs that behave properly at very low power levels many poorly made PSUs cannot handle.
I'm betting there are about just as many PSUs that fail to reliably deliver anywhere close to their apparent output power rating as there are PSUs that have problems with Haswell's extremely low idle power.
This merely raises the bar on minimum quality one little notch - PSU manufacturers cannot afford to overlook their PSU's low-output stability anymore. Thankfully for us, many of the changes required to improve low-power stability are the same that are required for high-power stability.