Since I'm out of work for the rest of the year, I had time to email & talk to Amazon again regarding the dropping of HDR on our Rokus. I finally got someone from "leadership" to acknowledge that 1- it is a known issue, and 2- that "they are working on it." He even told me that it was included in his daily "list of issues" email. He was skimming it and kind of reading parts out loud, but he mentioned it affecting over 5000 streams.
Keep calling and emailing, folks... somebody is finally aware that this is a big issue with us enthusiasts.
Sony 285ES, Carada 88" Criterion 1.1, Yamaha RX-A860, DT SM65 (2), DT CS8040, DT SR8040 (2), DT 6.5R (2), SVS SB2000, Oppo 203, ATV4K, Roku Stick+, Monoprice HDMI from AVR to all input devices, Sewell fiber from AVR to Sony projector