Large edits require care to reduce the risk of the author rolling them back. We want people to edit to improve posts, but if you think there might be disagreement on what counts as an improvement, tread carefully. When I make a major edit I explain clearly why both in the revision comment (which is there forever in the edit history) and in a comment.
To maximize success and minimize ruffled feathers, be objective and neutral in your comment. Avoid sounding judgmental. For example, in this meta post you referred to "fluff" -- which is ok here, where you're asking a general question rather than linking to a specific case, but you'd want to avoid calling the post "fluff" in that revision comment. I tend to reach for phrases like "focused on the core question" rather than phrases like "trimmed unneeded fluff".
Finally, if you have reason to believe that a particular user will react badly to a particular edit, it's better to take a lighter touch. Keep in mind that you have other tools available -- downvotes, votes to close (if, for example, it's unclear), and comments -- to provide feedback.