Disclaimer, I don't think this should be allowed, and should be discouraged. For my own edification, I'd like to get your insight on a little dispute here found in the comments to the question and to my answer:
SUMMARY: The user Jan questions the 'meaningfulness' of my answer. Proceeds to edit the question to add a medical perspective to it, and proceeds to answer it from a medical point of view. Originally the question asked the question openly and I answered with evidence from the molecular side of things, for a clear yes answer to the question. The user James advises the edit the question after a brief fo-and-fro with Jan ("I think you see the value in this question"), which I think is unnecessary and opinion-based and not in line with what this SE should be accomplishing.
I am curious whether I am in the right or wrong and whether this kind of action is allowed. I provide the link as a case study. Should this be encouraged or discouraged?