I really am out of my depth to speak to specifics of 3nm or how the hell physics even works at that scale. I can just assert that mass adoption of ubiquitous and tactile computing has dependency on speed, locality, and energy consumption.

That said, I found this really interesting: https://www.pcgamesn.com/samsung-3nm-production-performance

They seem to have shipped a novel gate design rather than just shipping a smaller-yet FitFET.

You're spot on that CPU power consumption is a just a part of the equation!