Thread:Talk:Requests for comment/Scoping site CSS/Using classes more/reply

To clarify, the commit message was just saying that one should use classes instead of IDs. That's not even remotely a proposal or worthy to write an RFC about, but a simple state of fact about writing proper CSS. Using IDs in CSS is exclusively bad practice. Sometimes out of laziness we use an ID, but it would always be an improvement to replace or supplement an ID with a class.

Find me one case where an ID is better, and I'll proof you wrong :)

As for this RFC (scoping of CSS), scoping is hard or difficult regardless of whether one uses IDs or classes. It might be slightly easier to scope things with classes, but it's mostly unrelated. I'm not sure why this RFC was mentioned in the second sentence you cited.