I don’t know if there’s really that much time overhead. If I’m spending $200 on that rail ticket, I’m gonna arrive at the train station early to account for any issues I have getting there, just like an airport. I find it a little frustrating that people argue that there is zero time overhead in getting to a train station but there’s like three hours with an airplane when in fact, it’s often two hours for airlines and one for trains in reality.
For flights you have to go through significant amounts of security which is often highly variable.
Further, flights tend to be distinct events. For many routes there may only be one per day, and even for busier routes you usually can't just hop on the next one without significant effects on your travel plans, for example rescheduling connecting flights. Trains on the other hand just keep running, there's going to be another one going the exact same route every few hours at most, likely less for busy routes. You can go to a train station without looking at the schedule, for a flight you're scheduling your entire day around it.
Shinkansen operates at a frequency of one train every 4 minutes on some of the busier lines. The $200 is mostly for very long single trips. It's mostly used by commuters who get monthly passes for cheap and are refunded by their jobs. I can't even imagine how horrible it would be to fly on an airline every single day. It sounds exhausting.
