Would it not be beneficial to be able to see (specifically) what the history entry (assuming the question is edited) of a question an answer relates to?
It happened to me recently, that guy asking a question edited his answer after receiving some first feedback and answers under the question were, after a while answering, essentially two different questions. One of them is not visible anymore. The history of a question may be looked up (I do not see it, but Meta search says otherwise?), but there is no way to know what exactly the answering guy was answering.
The point of Stack Overflow is to get answers, and fast, but it, in my opinion, should try to make it not confusing for future readers. If at least they try to pull the effort and understand the process happening after question was asked (question/answer time helps, but is difficult to work with). And I believe this is a feature that might help in a case as I described.