Not enough people that VTC are leaving helpful comments, or even comments that refer to the How do I ask a good question help page. This answer is in support of @vogel612 answer.
When I come upon a question that has one or more votes to close but no comments at all I feel that we are doing the poster and the community an injustice. The first person to VTC should provide a comment, and I feel that it should be clearer than just a link to the How do I ask a good question help page. It should provide the poster with a clear path to improve the question. In the case of LCC, tell the poster what is missing. If it is broken code tell the poster. Perhaps VTC should urge the closer to provide a reason like the flags do.
This may be a feature request that should be posted on MSE. There could be some canned selections and then a text field for open descriptions of how to correct the issue. This would help the poster before they get 5 votes to close. The earlier we identify issues the faster the question can be fixed, and the faster we can notify possible answerers not to post an answer.
The kind of helpful comments I would like to see is my comment on this question: Beginning BMI calculator in Java