Nevermind the M1 - what about an Apple watch? I'm wildly out of my depth with this but I look at stuff like this teardown and X-ray of the Apple watch where they describe the distance between components in microns and think that maybe that's reasonably difficult to repair that component.

https://www.ifixit.com/Teardown/Apple+Watch+X-ray+Teardown/4...

That being said, I would like it if the screen/battery/soc could be replaced independently.