But this only tells me that some monitors can show more colors than others. If you made a monitor that can show more colors, does it matter what you call it? SDR or HDR, it can still show more colors than other monitors.
The idea is that "full red" should always be about the same brightness (user controlled, so "same"). Not "red" on an SDR screen and "iris burning bright red" on a HDR screen. Essentially, you want to extend your color parameter space to give the iris-burning range new names so that SDR and HDR images can both be displayed sensibly.