> Sure, their own stuff works better with their own stuff, and yes, the watches can't be configured without a phone, but that's also true of android.

Android have quite good open source project for this:

https://github.com/Freeyourgadget/Gadgetbridge

Obviously its not what Google intended, but Android is just better when it comes to support of open source alternatives. Yet obviously as I posted already in this topic it's hard to build convenient infrastructure for yourself in general.