Very often questions are asked in an unclear form with crucial information missing; then people ask for the missing information in comments; then the OP provides the information in a response in the comments; then people ask the OP to please add the information to the question, explaining why this is preferable; then the OP may or may not react constructively.
This ritual might be curtailed at least in some cases by an entry in the FAQ explaining that questions should be self-contained, people shouldn't have to read through the comments to understand it, and if you become aware of possible improvements in the question, please make them.
Proposed FAQ question:
Why are there so many comments asking for more information, and no answers given to my question?
or in view of J.M.'s comment
What information should I include in a question?
(Other better formulation welcome.)