It’s 2023! There are so few SDR devices on the market anymore, and almost no SDR content being produced these days. While most of my 4K files are too big to stream without transcoding, it sucks that Plex tone-maps HDR to SDR without an option to just keep the same color space as the source. Especially because most Plex clients are aware of the capabilities of the attached display, it shouldn’t be impossible to only tone-map when strictly necessary (like streaming to your grandma’s TV).
I think this is a reasonable request but HDR is not ubiquitous. I am not your grandmother, I love gadgets, and yet none of my ~10 screens are HDR capable. I’ve never even seen HDR or 4k programming outside of a store display. And it will be a few more years before that changes.
I guess my thinking is pretty US-centric. But in the US everything has been HDR for a couple years now.
I’m also in the USA. Sure, new programming and hardware is all HDR but when a TV lasts so long … There’s plenty of SDR hardware still around, too. I don’t have HDR simply because I haven’t needed to buy a screen in a long, long time.
My phone is also 4 years old and my car is 23. 
