With my Anthem in the shop and using my Yamaha 5100, that was built in 2015, I have to say, this has been my best experience with ARC, no issues at all.
Thing I have experienced in the past, drop outs, lip sync, not locking on to the signal, have been non existent this go around.
Since my TV (TCL 98” QM85) is newer, maybe they finally have the software worked out.
But, when I get the Anthem back, will be using it as the switcher, no more ARC, TV just does not have enough HDMI inputs for all my components