Oh no, I wasn't directing that at you
I was directing it at FranceBB's description of their transmission process
To be honest though, as someone who's implemented PQ based workflows (HDR10 and Dolby Vision) for streaming services, it all works fine. For HDR10, Most of the displays just ignore the metadata and do whatever they want.
The Dolby Vision stuff is great, and works really well for preserving high luminance details and getting consistent color reproduction, especially on cheaper devices (TCL TVs etc). It also kicks in special rendering pipelines on the displays that do less bad things, and can result in sane output settings. People do wacky things to their TVs