Backing up Ron's observation, there have been times I filed, got the routing emailed to me and then, when I called HEF ground for clearance, told that they did not have a plan in on file for me. (Two occasions.) Then there was a time or two when I was cleared as filed and then, when I reported ready at the runway was told, "Stand by for amended routing." An amendment that lasted only until shortly after contact with Potomac Approach one time, and then after the next hand off, when more direct routings were issued.

424AF, why do you have (such and such) routing? (Me) no idea, it is what I was given. (Them) OK. Climb to 9 thousand. Cleared ESL and then direct.