Look, the rationale of pre-authorized business class travel for gov't executives (PS EX1s and above which includes CF Capts(N)/Cols and above was that executives were a) busy and b) fiscally responsible. Those execs, the reasoning went, would want to keep their time out of the office to a minimum so that would travel at thew last minute and they would need some rest on long haul flights if they were to be ready and able to represent the Gov't of Canada at important meetings.
I knew one exec who almost never went business class. He was in the midst of a divorce and he had a girlfriend in whatever city. He always tried to travel as far ahead of his meetings in that (foreign) city so he could to spend time with her. He was a good guy so he always travelled economy and claimed his weekend hotels - fair enough, I thought and still think.
I routinely declined business class on many domestic trips (including Washington) because my directorate travel budget was always overcommitted, but I and my deputy (Eng-6) and Chief Engineer (LCol) used business class for most flights that were long haul including even Brussels and Genevan for the reasons it was intended and available for us.