Lots of good information, thanks for sharing.
Reminds me of a question on multi-room music volume control.
When I attempt to adjust one speaker, as in this picture, several other sliders may (or may not) move at the same time (up or down). I also see the speaker's name change while in the midst of moving a slider too.
If I go to the settings for individual echo devices the volume works as expected as well as I can adjust all device volumes at the same time using the volume buttons on the side of the phone.
It's been this way for a long time and I'm not sure if I'm doing anything wrong or if this is the way it is.
Any ideas?
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