I didn't make these rules, nor am I commenting on whether they are right or wrong.
That is simply how it is.
(Your counter-example of going to sit in a different area altogether, that your ticket would not allow you to access, is a bit pointless, btw).
The rules are REALLY, REALLY simple aren’t they?
1. If you insist on the seat printed on your ticket, arrive early.
2. If you want to sit down, sit at the front.
That’s it. :shrug: