HDR10 is fine right now. I don’t know of any tv that has a 12 bit capable panel or can create over 1000 nits brightness. HDR10 supports 4,000 and Dolby vision supports 10,000. TVs need to get a lot better before Dolby vision makes a difference.
The per-scene dynamic metadata of Dolby Vision is what makes the most difference in my opinion, not the theoretical max nits / bits. I can see a pretty dramatic difference on my LG C9 OLED when watching HDR10 vs DV.
I wasn’t aware! I have an LG B7 and it’s maximum brightness is like 800nits, and even that seems too bright a lot of the time, so I turn on “power save” mode which dims it by about half. No wonder I never noticed any difference.