As a happy owner of an AV20, I would still not recommend switching. You probably will not notice any difference bar those minor issues you mention.Any owners here moved from an Anthem to the Marantz? I am considering a sidestep from my Anthem Avm 70 (4k) to the AV20/10. wondering if you noticed much difference in sound quality? I like the Anthem but its test tones during calibration are ridiculously loud so much i fear that it might eventually damage my speakers, plus the whacky reference level setting that drives me nuts.
Both the Anthem AVM 70/90 and Marantz AV10/20 were the ones I really wanted, each with their own strength (not many weaknesses in any of them), at the end it came down to pricing and size, so ultimately it was : AVM 70 vs AV20.
If you really want to "sidestep", consider waiting for the next generation in a few years; and even then you probably would just get the new features, not hear differences.
Use the money saved to condition the room and upgrade speakers instead, you will get really differences there.