[juicypt]

I think there's a reasonable middle ground here. I would think it's fine for them to keep their algorithms closed-source, but be required to opensource the minimum amount of firmware to allow access to all of the hardware: bootloader, CPU, storage, memory, display, and sensors.

No need to reveal any trade secrets at all. The above stuff is not the secret sauce that makes people buy their watches anyway: they use some of the most basic hardware in the market at their price point.

[palata]

This is exactly what I meant. I don't want Garmin to give me access to their algorithms. I want to have a way to flash a minimal system on it if I want to play with it.

For something like Marshall smart speakers, it may end up making those products actually good: I could totally imagine an open source system for smart speakers. And that would be infinitely better than the crap Marshall put on the one I own.

It works well for routers: on many routers you can install openwrt or opnsense.