But it's not just BSTs that MPK. Heck, if I wanted to I could pull a stupidly fat train from the bottom of CN --> Horde Lullaby --> Escape (with /BLM).

Me and a ton of other jobs could easily MPK just as much as BST... perhaps people just see it differently with BSTs for some reason. I've seen more accused BST MPKs than actual MPKs.