Editing someone else's question is wrong in my view. The comment facility should be enabled to any question without a time limit. If there is anything wrong with a question, then the reviewer should notify him/her by commenting on the question, not by editing it.
Editing the first question is a bad practice, because it changes the motive of any problem. Suppose I wrote a question in a hurried pace, and I mistakenly wrote wrong code. If an editor corrects my question to a modest way, and corrects the code bug, then the whole answers below the question will be for nothing.
That's why editing someone's code/question/answer should be prohibited in my view.