I’m not sure I agree with this contention. The impression I have is that expensive computers and screens have the capability. For instance, the only Macs that can display HDR are MacBook Pros or the (expensive) Apple “XDR” monitors (not MacBook Airs, not iMacs, not the Studio Display).
I’m sure there are plenty of monitors out there that aren’t HDR, and plenty of laptops, too.
Of course.
I’m not suggesting that HDR should be the only available output, however it’s great to be able to specify your output gamma and color space to Rec2100 ST2084 in case you aren’t working with sRGB.
Also, the current output formats, being only 8 bit for JPEG and the lack of support for modern image formats (10bit and more, such JPEG XL, HEIC, etc) is quite painful, especially if you want to bring it into further editing. (You have to rely on TIFF, which is very space inefficient currently)