I played for 12 years, and that was NOT my experience. If some of the BST haters are to be believed, I think servers must be quite different.
I exp'd a lot in crawler's nest. There were so many places for BST to exp without being near parties that there was no need for contention there. Parties fought over camps like crazy though. I loved CN as BST, hated it as a partier because of other parties being such jerks competing for spots. As BST, I was asked to CLEAR trains quite often before the change. Usually, the cause of a train was not BST but parties who had an inexperienced puller who panicked or a THF decided to flee out of there for fun. I don't recall BSTs specifically doing this.
I do recall BSTs MPKing, mainly in response to people stealing their NMs at low health. I am sure some BSTs did it for fun just like some people just liked to train mobs on others for fun. I posted elsewhere about why a person who really wanted to exp as BST would NOT waste time competing with a party. It was stupid if you need mobs to charm, not to move to another area. Sure some BSTs were probably stupid, but I was in too many parties that were just as stupid about competing for a party spot. Party spots were a pain for everyone back then, less for BST than a full party. One of the reasons I loved BST. I could come and go as I pleased without drama.
I actually liked the MPK nerf because I no longer had to stop exping to go clear trains, and I could also charm a pet and despawn it so it would repop as an even match. I see nothing good about this change that doesn't let me command my pet when I'm right there fighting with it. I wonder how people would like it if they couldn't use their special abilities unless they standing within this range to a tank? Sure, melee could just run over to the tank and back. That would make their jobs much more fun! That's how I feel about this ridiculous range nerf.