I am not so sure that NPAS has actually been failing to answer the quesations wholesale.
Personally they have been fairly open..... anything off limits being declared as such but to me my thoughts are that I have been getting so much information that it is difficult to remember it all in a structured way.
I fully accept that I may now be in a better position than most these days and suspect that those 'in service' are finding it difficult to know who/how to ask an how to get feedback from those that have asked.