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Beepy, a palm-sized Linux hacking playground
(hackaday.com)
This is a most excellent place for technology news and articles.
Not an expert myself, but I think chips that truly sip power not only have a much lower floor but take even more aggressive actions to reduce power when idle.
Certainly with the right software tuning you could aggressively throttle the CPU to save power - I'm just not sure how much power it would actually save.
I did find this really good article on reducing the Raspberry Pi Zero 2W power consumption: https://www.cnx-software.com/2021/12/09/raspberry-pi-zero-2-w-power-consumption/