You wrote " they expect your TV to be the center of the above diagram and the TV is the output to a surround sound system that has only inputs. "
This will fail fabulously if you tried that with the usual Samsung TVs. Why? Because Samsungs, all the models I've run into for years do not pass HD audion when the source is HDMI. "It's dead Jim."
The model that is expected from my experience and what I see all over is:
All sources to the Receiver then maybe an optical link from HDTV back to receiver for OTA and app sound.
In your case you don't have a HDTV so the usual receiver will do great.
I need a good BluRay/Surround Sound system (preferably 4k but not critical). My problem is that I use a projector rather than a television type monitor to stream content. Projectors are not designed for sound, so I use the following configuration:
Roku/FireTV - HDMI - Surr. Sound/BluRay - HDMI - Projector
The box in the middle (Surround Sound/ BluRay) handles the sound and passes video to my projector.
These days, manufacturers have dropped the HDMI inputs on the surround sound boxes expecting you to use their own built in apps rather than Roku or Amazon Fire or use smart TV apps. They expect your TV to be the center of the above diagram and the TV is the output to a separate surround sound system that has only optical input for audio usually.
Projectors don't have optical out or HDMI out so this will never work for me. Any ideas??

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