The problem there is that you're now refactoring a bunch of code that is working on the other 99% of your pages. This model is great, but in CSS when doing thi

The problem there is that you're now refactoring a bunch of code that is working on the other 99% of your pages. This model is great, but in CSS when doing this in order to fix your current problem, you are almost guarenteed to break other layouts elsewhere, and very very few people are using automated view testing to see if layouts break. I think this is the core reason why functional CSS is growing, because by separating out your layouts from each other, one can actually approach CSS refactoring this way without worrying about breaking other pages.