If you plough through the very long threads on this subject you’ll find others, including myself, in favour of a proper (much lower) minimum brightness value, this time associated with a revised table of settings for the adaptive brightness, so that, for example, what used to be 0% would be replaced by 30%. Example discussion:
Changing the table settings would avoid the adaptive brightness “bug” that the majority of people have been complaining about since 5th August.