I'd be interested to see what sort of edits fall into the third category, but I'd hazard a guess that many of them are not actually going to be [[WP:BLUESKY]] things. The follow-up action might be a dialogue that raises [[WP:BURDEN]]. Basically, to the new editor, "it's easy enough to Google this" might seem reasonable, but to a vandalism patroller going through hundreds of edits, they don't have time to Google each one — they're just going to revert with the default uncited summary. The person adding an edit is always the one best positioned to add the reference, since they already have it on hand, so pushing them a bit to add it may reduce the burden on others/result in more new content getting preserved.

I also continue to worry that the presence of the options may give editors false ideas about Wikipedia policies. E.g. by having an option "The information I'm adding would be easy for anyone to verify," it may lead newcomers to think that the policy is that easy-to-verify info doesn't require a citation, which is not correct. We wouldn't want them carrying that impression forward and not citing future edits, so it's important that the follow-up message disabuse them of it.