In reply to Piet.

Because he's twisting a core philosophy and trying to apply it to themes, which have never and will never target 80% of the user base. (We want people to use as many different and customized themes as possible.) That's not the goal of the Twenties. Also 80/20 is a rule of thumb, and sometimes we may override it for something niche but that we think is important for the platform, like post revisions.