It's been a while since I've used it, but IIRC this is actually my favorite feature: it encourages the use of stylesheets vs ad-hoc formatting. As annoying as it is in the moment, when it comes time to integrate multiple documents into a consistent whole (or apply entirely new styling), having a stylesheet vs. miles of ad-hoc inline styles makes it fairly painless.

Sadly... The rich text editor I mostly use these days (Google Docs) goes in the complete opposite direction; trying to apply a new stylesheet is mostly a waste of time. Which is why for any non-trivial document, I mostly rely on Markdown -> HTML + CSS.