This is a fantastically well written blog article, and there needs to be more attention paid by the industry to issues such as these ones raised by the author.
I've generally found that all the IT vendors have an incredibly lazy and sloppy attitude to imaging of all types, not just display scaling or font rendering. "The pixels went on to the display! Good enough! Ship it!" is the attitude.
Compare this to televisions, where there 120 Hz is common, 8K is a thing now, wide gamuts and HDR are not only supported but consistent and even calibrated out of the box! Dolby and NetFlix in particular have put significant effort into making sure their customers see the original artistic intention, not some faded or garish mess.
In the PC, Mac, and smartphone world it is literally impossible to send someone either a still image or video that'll look even vaguely correct. It'll be too bright, or too dim, faded, or worse: the colours will be stretched to the maximum display gamut. Photos of faces look like zombies or clowns in full makeup.
HDR is simply impossible to use for still image exchange. No matter what some random JPEG committee is working on, don't even think about such nonsense as sending someone a HDR file, it will practically never work, no matter what display the recipient is using. Or even just an SDR 10-bit file. You're wasting your time.
To give you an idea of how insanely bad this is, for years and years if you enabled HDR for your display under Windows 10 it would simultaneously wash out the desktop colours, dim it until it was way too dark, and then blur everything on top of that so that your 4K monitor is pointless.
Clearly nobody actually tested HDR support at Microsoft. After they received complaints, both to their tech support and in public... they did nothing. For years. YEARS.
I just find the whole thing incredibly sad. It's 2020. The future! The physical technology for nearly perfect display output has been available for years, but... no. You just can't have it, because the software won't allow you.
It doesn't matter what display you buy. You can't have HDR, or 10-bit, or colour management on the desktop, or your browser.
Firefox has had full ICC colour management for many years now. It's off by default. Internet Explorer truncates everything to sRGB even on a wide-gamut screen. Safari stretches colours for un-tagged images.
The only HDR and colour-managed thing you can reliably do on a PC is watch NetFlix. That's... it.