There is information in the main estimates on programs, but you are absolutely correct. In the report on plans and priorities and the follow-up departmental performance report, there is more time given to program plans and achievements. If you wanted a good discussion about the future of certain programs or the past performance, they are fantastic documents to use for that discussion.
The estimates are all about the upper ceiling for spending in this fiscal year. The main estimates set the initial bar and then you add to it through supplementary estimates, so it's not a great vehicle for that discussion.