The most recent example of the problem stated in the title is this question:

what is more difficult to calculate from the viewpoint of a computer : the "sum" or the "maximum" of a finite set of numbers ?

Can we come up with a model that separates sum and max? For example, could we show that in certain models, computing the sum of b-bit numbers requires strictly more extra space (in addition to the read-only input tape and write-only output tape) than max? Or is the answer always trivial?

While not claiming to know the intent of the OP, it seems to me that the original question was fairly basic, but the reformulated question is far more interesting (to me) and is actually a reasonable research level question.

In fact, the reformulated question also has a nice answer.

So my question is:

• Would it be appropriate to edit the question to reflect what appears to be the more interesting question
• Would it instead be better to encourage the commenter to post a new question ?