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BetterTouchTool has a "Bluetooth LE device moved away".. Maybe that can detect Apple Watch moving away, and then lock or even shut down the computer..

EDIT: Confirmed. This works. In a few minutes, I was able to set it up so that if my watch moves about a meter away from the mac, it'll lock the screen. It supports any Bluetooth LE device.

I had moved away from BTT for a while but would come back for this. Awesome. This stuff should be in macOS core.

Unlox app does this - its primary feature is to use FaceID on an iPhone to unlock a mac, but it also has an AutoLock feature if said phone goes out of bluetooth range. The signal level threshold is configurable so you can keep it on a pretty short leash.

(no relation, just a happy customer)

That is intriguing -- but I don't love the "enter your computer password in the app" part. Can it be configured to _not_ do that -- i.e. only do the "AutoLock" part?

I believe so, yes. you might need to do a temp password dance to get it configured initially, but after that "lock only" should work fine.

Perhaps an accelerometer for when it's snatched quickly.

Should actually be pretty easy to implement