Good and fair comment. Just adding some nuance:
> There is no support for power-efficient sleep
"power-efficient sleep" refers to discharging 1-2% battery over night rather than 10-20%. I.e. there's room for improvement, but the device can still be used without worrying much about battery life regardless (especially given how far a full charge gets you even without sleep).
> Display Port, Thunderbolt
Big item indeed, but it's actively worked on and getting there (as you mentioned).
> video decoding or encoding
Hurts battery performance, but otherwise I never noticed any other effect. YMMV for 4K content.
> touch ID
Annoying indeed, and no one has worked on this AFAIK.
> The speakers overheat and turn off momentarily when playing loud for a longer period of time. The audio stack in general had to be built from ground up and it seems to me like there are bits and pieces still missing or configured sub-optimally.
Sad to hear since I thought the audio heat model was robust enough to handle all supported devices. On my M1 Air I've never seen anything like this, but perhaps devices with more powerful speakers are more prone to it?