Thank you for the detailed explanation! Most of it is well above my pay grade. If I read it right, the answer to my question is "no".
I am not a developer and won't be flashing any other software. I will leave that for folks with different talents than I have. I will just be using the watch and the software others have the talent to program for the community.
When I said mentioned my purchase decision what attracts me to the project is it was advertised as "open source" in the 1st article I read, then I was told it isn't fully open source. I am trying to move as much of my electronic life to open source projects.