I was thinking about my chart rather than what the board makers are up to. I'm pretty sure the performance scaling based on power input is Intel's doing, though of course the board makers have to provide a way to set it and supply enough power, etc. and I had to supply a cooling system.It's not intel. There's a thread buried somewhere in the intel motherboard forum - it's the motherboard makers trying to make the review benchies look good, by being "faster" than the others.
I get why the board makers turn off power limits, I just don't like it. It's like the twitchy gas pedals you get in some cars so they feel snappy during a test drive even though it's a midsize sedan or compact SUV with a 2.5l NA 4cyl or monitors being set to 9300k by default because it looks good under the fluorescent lighting in a retail store even though the color quality is crap. "Winning" at benchies when the reviewer doesn't know enough to check the power settings might be good for sales, but it's often not good for the customer.