You have to set up a bash script to do something as basic as change the scrollwheel speed. Bluetooth is extremely spotty. Installing most software is still a pain unless you know all sorts of terminal-fu
I could go on, there's many basic features MacOS has been missing for going on a decade, let's not pretend they get it all right either.
The whole HDR thing seems more like a meme or weird flex type of thing to me, I've never noticed it ever really making a difference for me.
Also a weird hill to die on when talking about relative strengths of each platform, but you do you.
You won't notice a difference most of the time in normal desktop use because most desktop apps and the web are all SRGB, and get tone mapped accordingly when HDR is enabled. To really notice a difference with HDR content though, you need a good HDR monitor and not just one with basic DisplayHDR 400 certification, and either an OLED panel or mini LED full array local dimming.
Windows' HDR implementation is far from perfect (the gamma tracking on SRGB content is incorrect, for example), but it's a far cry from Linux where HDR support just doesn't even exist. I can't even realistically use Linux as an OS for a home theater PC anymore.
macOS is probably the gold standard when it comes to polished HDR support, especially with mixed mode use (HDR and SDR content on screen at the same time)
Linux on the Desktop has finally arrived !