Except sometimes the mask looks ok and the grey bar under “mask post-processing” looks good, like this:
so you switch to the Advanced tab and it looks like this:
So you realize that it can’t be ok and go back for some more tweaks. I admit, I sometimes find it challenging to tell how good the mask is from the mask alone. I know I’m looking for smooth blurriness in tonal regions but preservation of the edges, but I do find the histogram to be a safer judge of how good my mask is.