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While we all wished that worked my opinion is the industry blew their chance at setting this as the way to connect it all ...reliably... You did write a lot but my answer is that ARC is too unreliable for me to give anyone the idea it works well enough to trust it.
To that end I continue to connect up with optical, analog or bluetooth. What I use varies with the set and system. Optical cables run http://www.amazon.com/AmazonBasics-Digital-Optical-Audio-Toslink/dp/B00NH11H38/ about 6 bucks now.
If you feel Samsung should fix this, tell them and if they can't fix it, start asking for refund.