Idk if this covers your needs, but Home Assistant is non-cloud and supports voice commands. They're selling a voice hardware now (preview edition): https://www.home-assistant.io/voice-pe/ While I've used HA for years, I've never tried any of the voice command methods, so can't really comment on it. I had just recently came across their voice hardware and am probably going to give it a try.

So confirmation bias. Gotcha. That's generally not a great way to make sweeping generalizations about 50% of the population. You ever hear that adage about smelling shit wherever you go, maybe check your shoes?

Alpro Not Milk comes pretty close for me, oat drink.

If AI constantly refined its own output, sure, unless it hits a wall eventually or starts spewing bullshit because of some quirk of training. But I doubt it could learn to summarise better without external input, just like a compiler won't produce a more optimised version of itself without human development work.

Isn't the most common failure modes of electronics capacitors dying, followed closely by heat in chips? This research sounds cool and all.