It's still better though.

HDR displays are >1000nits while SDR caps out at less than 500nits even on the best displays.

Eg for the Samsung s90c, HDR is 1022nits, SDR is 487nits: https://www.rtings.com/tv/reviews/samsung/s90c-oled#test_608 https://www.rtings.com/tv/reviews/samsung/s90c-oled#test_4

Double the range is undeniably still better.

And also 10bit instead of 8bit, so less posterization as well.

Just because the implementations have been subpar until now doesn't mean it's worthless tech to pursue.