I wouldn't call this janitorial work. This seems to me to be less like someone cleaning a building than someone replacing every pencil in the building with a #2 pencil, because they believe that type of pencil is the correct type of pencil to use. They haven't made anything materially better, except by their own rigid definition of what the best pencil is--and maybe there are advantages of using a #2 pencil over a #3 pencil, but if you brought that pencil to work, there's a chance you brought that pencil because you prefer writing with it, and you wouldn't want someone, despite their best intentions, replacing your pencil with a 'better' one. Almost no one is going to look at the graphite and not be able to recognize words because it's a #3 pencil and not a #2 pencil.

In my opinion, this isn't what built Wikipedia, this is what made Wikipedia hostile to new contributors.