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There's lots of noise in the accelerometer readings, even without shaking

Shake your Mac to undo would be consistent with iPhone, iPad, Vision Pro. Yes, you shake your head to undo when wearing AVP.

This is a milder version of “Shake to Reboot” which is standard for all Etch-a-Sketch models

Probably not as random as you want it to be.

well wouldn't it add up?

someWhatRandom1 xor someWhatRandom2 xor notRandom3 xor ...

should be more 'random' than just 'someWhatRandom1'

i'm not sure it would necessarily be more random if you're mixing in a lower-entropy source which the accelerometer probably is

XOR is the worst hashing function imaginable, especially if the data isn't truly random, because it can cancel out to become even less random!

It's better to use a KDF or something. Even a block cipher should work far better than XOR.