I have asked 31 questions on this site, and I have to say that the most valuable answers/insight (for me at least) are more often than not contained in the comments. This is because often (and I do not think I am alone in this), those who answer cannot read my mind, and so the answers that are given leave out some crucial insights that are at the core of my misunderstanding. I often have to "tease out" that answer in the comments. It would be great if always, once this happened, the author would edit their answer to reflect the additional clarifying details, but often they do not, and the real answer to my question, the thing I wish to return to if I ever look the question up again, is in the comments.
Me: "Why is A?"
Answer: "Because of B!"
In the comments:
Me: "But what about C?"
Answer: "Ah, that is because of D!"
Me: "Aha! Thank you! That was my sticking point!"
So I find it greatly distressing to learn that some of these comments might be deleted. It just seems to be fighting against all that is good and useful about this site. It seems, in practice, anti-educational.