I recently came across several suggested edits by the same user (I won't link here, but they should be easy to find if you have access to the review queues).
Each one amounted to changing "How to...?" titles to "How can I...?" titles, with the comment "improving grammar."
In the first case, I tried to improve the edit. My gut instinct is that edits that only change a few characters may need to look at the rest of the post for improvements; rarely is such a short (non-meaning changing) edit necessary.
The next I rejected as not a substantial improvement (I wish I had the exact wording available, but no matter).
I skipped the rest because I thought, well, maybe I'm just being a little uptight about this whole thing.
I would welcome feedback: the edits meant no harm, obviously, and I don't want to signal to the user that editing is "bad." But they didn't seem a substantial improvement to readability or quality. I don't think this any thing to get worked up over (we have enough of that already)—consider this more of a "Seeking guidance—what do you do in this situation?" kind of post.