So many rather stretched examples of why flexibility is needed.
Most of them ignore that you would be able to change reservation.
The dying parent ignores the “what do people do who don’t live near a railway” issue.
All ignore the convenience and comfort of those who have been organised and got a seat.
Short distance trips have been dealt with conceptually, but the detail would have to be case specific so no point going into details.
Business meeting scheduled to last an hour, so I book in a train an hour after its due to finish (knowing that they tend to overrun by 30 minutes but still leaving me with time to rebook if it goes on a bit longer). The meeting lasts 1 hour 30 minutes and at our wraps up the client says can I talk to you about a new project.
I quickly cancel my booking (whilst the others leave the room) and notice that the next three trains are already fully booked, but leave the rebooking until later as I've got a client to talk to.
Finish taking to the client and go to rebook and find that the next train with space is 90 minutes later so I've got that time to waste.
All the while this is costing the company I work for money.
I then arrive at the station for my scheduled departure and find that the train I was due to catch has been cancelled. There's no spare seats on the next 5 trains, meaning that I've now got another nearly 2 hours to fill. All the while costing my company money.
Upon return to the office, is the third time this month (totalling more than a day of lost time) that staff have been delayed getting back to the office due to missing booked trains, to find a company wide edict banning all rail travel.
That's not that far fetched, but those who are supportive of only booked travel haven't dealt with this being a problem which could sufficiently reducing the amount of business rail travel which happens.