With the current implementation of the game, you can only queue for trivial content using the dungeon finder/lfr, this doesn't stop people from briefing others. And it happens more often than you think.
I could list out too many times I've been kicked just because I spoke up and called someone bad out something a long those lines and I'm sure I'm not the only one.
People rarely if ever use the tool to remove an actual problem player, I.e. Player who is afl, or worse.