No, it's all supported, at least HDR10+, and I know how to calibrate the screens, been doing it for 25 years, so it's nothing to do with incorrect settings.
I don't like it much on OLED screens either, from what I've seen on my Samsung tablets. The brightness automatically goes up to 100%, that irritates me to no end.
Got an LG OLED sitting brand new in a box, but after war started, I put everything on pause and am in a sort of limbo now for over 2 years, not unpacking it, not assembling 17 new Billy shelving units, not doing anything in the apartment... just still buying discs like an idiot, and putting them in boxes. Ya'll making fun of someone here keeping their stuff in boxes, well I'm doing that for real. 74 large boxes as of now...