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“If you calibrate the HDR screen to be as dim as the LDR screen they’ll look the same” isn’t a great argument.

So turn up the brightness of the LDR screen to match the HDR screen. The brightness isn't why HDR is HDR.

I didn't say to turn down the brightness of the HDR screen. I said the brightness per area must match.

Using maximum brightness often harms color reproducibility too, by the way. So if you believe brighter = better, don't.

No the dynamic range and wider color gamut is. Your argument is that 10-bit sRGB doesn’t give you anything over 8-bit sRGB, which I don’t agree with but it’s reasonable.

But that’s not what HDR is. 8bpc is definitely not enough to represent HDR Rec.2020 or DCI-P3 without significant banding.

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