You can optimize it later

How many people you think have done exactly that, huh? You'd think this would be a no-brainer. But no. We still have dozens of classes on every element with the same 5 MB CSS framework. Do you know why?

BECAUSE NO ONE DOES THAT!

Because why in the right mind would you want to fix something that isn't broken? You're on a tight schedule, anyway. So ship it as-is!