Your approximation isn't really better than theirs.
It's true that you can't go below black, but SDR has extremely bad precision below 1 nit. HDR can accurately represent scenes at least 100x darker than SDR, in addition to bright spots at least 100x brighter. https://2.img-dpreview.com/files/p/TS940x940~forums/66687985...
It's true that you can't go below black, but SDR has extremely bad precision below 1 nit. HDR can accurately represent scenes at least 100x darker than SDR, in addition to bright spots at least 100x brighter. https://2.img-dpreview.com/files/p/TS940x940~forums/66687985...