I steer clear of BST in dyna when I can but recently it's impossible. I get that they're great farmers in there and on some levels I don't see the issue. However, I give them allowance for 2 mobs and maybe a 3rd if it linked. If you're sitting on 4-5 AND there are no others up, well I'm going to take them from you. If you're stupid enough to proc them all, then you'll fall foul of people I know who will wait and fell cleave. I don't do that but I know people who do.
RIght now BST is job de Jour in Dynamis. Wait for the new content and the new shinies and then see what happens. Dyna is about to get crazy again in a new way, with people farming for relic +2 items.