I've done a fair bit of editing on SO during my tenure here.* I've spent some time hanging out in /review to find things to improve. Most of my editing, though, has been done on a case-by-case basis, in the course of my normal usage of the site (either looking for answers, or hanging around reaping rep).
Once in a while, I see a user whose posts all need improvement, and usually the same kind of improvement. For example, one of the users I have in mind posts question titles in the form "Tagname - more or less vague title ???" -- aside from that, the questions generally need some retagging and always need grammatical and possibly formatting cleanup.
I'm wondering whether it's a good idea to edit a large chunk of this or any other user's posts in one go. Does that seem impolite? Does it seem likely to be perceived as impolite? Do I need to alert the person beforehand? Should I perhaps start with the old questions? Is this bad for the site in one way or another (one concern here is flooding the front page)?
Doing this in assembly-line fashion would in some ways be easier than doing it piecemeal. There are likely to be many of the same kinds of fixes needed across all posts by one person, and I could sit down, pour a tasty beverage, and spend half an hour cleaning up one little corner of the site.
To be clear, I'm talking only about editing questions that need improvement in more than one section of the post -- title, body, and tags. I'm not considering just editing out "Thanks", but on making substantial improvements. The catch is that these improvements would all be on one user's posts.
Possibly related (but mostly addressing mass retagging):
Etiquette for enormous hand-sorted retagging jobs
Too much retagging
What to do with users making lots of pointless edits?
What to do if a user is editing tags in a lot of my questions? (This one is from the point of view of the editee, and objects that the tagging was incorrect.)
What is the etiquette for modifying posts? (General editing etiquette; does not address mass, serial edits.)
I haven't really found any discussion of mass editing on the entirety of questions. What are your thoughts?
*Got Copy Editor after about three months.