They use their cabinet for more important meetings. The staff is there for various reasons, whether it be security and plenty of other issues. Many presidents have cut the second they're in office. It is realistic, for many different reasons. Budget spending during the first few months is usually terrible due to all the different cuts and plans. The WH staff is more directed to all the needs of the president, it would take longer to reach out to a dedicated branch to get the proper sustainable answers/help.