Seems like there are two things they want to see fixed:
> Several developers report that, in their experience, Black made code formatting worse and decreased readability. Concrete examples shown in the discussion were short lists, which Black reformats when they fit on a single line, and vertically aligned comments, which Black is unable to preserve. This is being addressed [0] in Black and is expected to be resolved before Black becomes stable.
> Several developers report that, in their experience, Black made code formatting worse and decreased readability. Concrete examples shown in the discussion were short lists, which Black reformats when they fit on a single line, and vertically aligned comments, which Black is unable to preserve. This is being addressed [0] in Black and is expected to be resolved before Black becomes stable.
[0] https://github.com/python/black/pull/826