I'm not sure what is unclear to you here. They do support the idea of blacklisting for every possible unpopular config, despite it possibly working. This is not only common sense, it is what every company does. When you write your software, do you test it on every possible distribution users could use, or just the popular ones?

The common distribution was blacklisted not because it was not tested, but because it clearly has issues observed and reported by the users.