Many thanks I understand much better now. I'd assumed the extra bits were needed to specify the greater luminance for HDR but I've realised this isn't how it works after a bit more reading.
You're right, 10 -> 8-bit dithered by madvr looks almost identical to 10-bit native close up, and is completely indistinguishable at viewing distance. Certainly not worth worrying about!
Thanks again!
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