A lot of thought has gone into your setup. One observation...I still think the decision (Bose) to rely on the smart TVs to do the component switching relies too much on TV makers, hence all the problems with ARC. I prefer systems with a separate console like the SoundTouch 130 or Lifestyle systems. However I see the greater market seems to be shifting to simpler and simpler setups, Bose seems to following suit with the 500 and 700 line.
Synchronization of voice may illustrate that the Home series of speakers may be more than just rebranded speakers.
That Solo 5 is feisty, nice to hear about your experience with it and the SoundTouch adapter.
I use Apple TV and Airport Express routers attached to TVs, Solos and SoundTouch speakers the same way, they sound great!
I have a BlueRay DVD/CD player attached to my CineMate 130 console. Never use it. I ripped my whole CD library into iTunes and use Match and Apple Music to play to all my SoundTouch speakers.
Lots of fun taking this setup down and reassembled when I moved recently. Everything worked well though.
I have enjoyed pretty good success mainly because I tried to used the gear in a manner for which it was designed, stuck with Bose and Apple standards and good cabling.