If it's a Hunt, then it's a free-for-all. It's annoying that there's someone doing an early pull, but there's not going to have a patience of a saint to wait you or Joe Blow-Schmo if you show up late. You have to be either committed or willing to show up on time, or always assume there's going to be an easy pull and there's nothing you can do about it.

If it's at a dungeon, then yes it is annoying as hell. Specially if you or somebody that's new, which you want to need to explain mechanics of boss to make sure everything runs smooth as silk, but then there's always some overzealous White Mage does an Aero or some DPS with an range attack while typing up during the first sentence which makes the newbies confused and more likely to die. It's a major pain in the ass as a Tank.