Normally I'd agree with you, but I can pick my swim lesson time and I don't have to worry about headway timing because I know when to leave and the train is tim

Normally I'd agree with you, but I can pick my swim lesson time and I don't have to worry about headway timing because I know when to leave and the train is timed. For untimed services, certainly I'd believe it. These are complaints of generality that don't have relevance in the specific case.