That's why you ask "what can I do to improve". I never cared if anyone came to me and asked about where they could play, could they play more, etc. as long as it was respectful, sincere and not a constant irritant.
But you can ask any kid that has every played for me the question and I promise you everyone will answer the exact same way. What position did you play on Coach Carter's team..."wherever coach said" period end of statement, because I drilled it into their heads.
I am not afraid of explaining myself to a player or parent (up to about 14U) for that matter before hand, "this is what I look for, this is how I balance my lineup, etc....granted as a coach don't have to and if you ask me one too many times or with a bad attitude I made just tell you "pound sand, if you don't like it find another team" but once I post the lineup you don't get to ask any questions or whine or complain or do anything but go out there and play ball.
Sorry - I wasn't clear - according to DD the coach made it clear that any way the question would be posed (positively or negatively), it would not be welcome or discussed further. I agree wholeheartedly with you that such a question should not only be welcomed but seen as a positive sign.