I don't think this is a high-priority bug, Sobol-Burley is locked behind the debugging setting. Users should never encounter it.
Sample comparison (intentionally not denoised to show noise level):
Old:
New: 
I've opened a PR for the unit in !123337.
I think the proposed change to the default is still reasonable, so maybe we can repurpose this PR for that? I'm not sure about 6500K specifically since…
But I think the purpose of inverting the display transform is also to make it so that the chosen color is white after the view transform has been applied. I'm guessing that's the default…
I don’t think using the temperature subtype is a good idea, because colour temperatures are always expressed in K, so even if someone uses °C or °F for simulations, they will not want to see…
For the color picking, I'm getting the feeling that instead of trying to invert the display transform, it'll be easier to read the pixel data from the viewport GPU texture before the color…