Because there is no need normally to terminate at Crowborough. They only do it to help their own punctuality figures. By making it clear that passengers are not happy to put up with this, then they will need to rethink their strategy. Also when you get chucked off there, the next train isn't for...
The way they treat passengers on that line is unbelievable. Big fan of the leaning on the train to stop it going, I have been saying that sort of thing should happen for ages when they terminate at Crowborough.