This is a general question regarding the editing of the questions.
I see that recently many old question on Mathematics Stack Exchange are modified by the a single user and hence are shown at the first page of the site. The edits are definitely time consuming and are meant for good. I understand that. I was, however, wondering if this procedure facilitates the search mechanism on the website?
If the edit comes as a comment to the OP then the OP will learn how to set up a question. In the comment it makes sense to explain why the editor thinks such an edit is required.