I'm not clear on your goal.
Think of your MX122 of a switchboard which is the brains behind everything.
It will be easy teach you family to hit the cable button on the MX122 remote.
ARC necessary if you want to use your TV's netflix/amazon streamer.
it allows audio to return back to the MX122 if you do it right.
If you use an Amazon Fire streamer ARC isn't necessary.
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