You can indeed bypass it by getting the Y ticket, but that could be more hassle than just calling ahead the day before. I'm always loathe to do anything that is an attempt to circumvent TSA rules. The minute I do, they will catch me and I wouldn't be surprised if it was a violation.

Not sure how this could possibly be a'violation'. One of the main reasons people buy Y tickets is because their plans may change and they need the flexibility. This has happened to me many times, even after I have cleared security and am waiting in the PC to board the aircraft. Even Gordon might be upset if he found out that his customers were avoiding buying Y ticekts because they may upset the TSA