To clarify, I finish the encounter before turning off the game. The way I wrote it was misleading and I apologize.
Regardless of what you do while queued, there is still a huge disparity between the dungeon reward and a primal reward. If I'm in queue and get a dungeon it takes about 40 min total and you get roughly a full level (at middle levels). If I'm in queue and get a primal it takes about 20 min and you get a few hundred EXP. When you've only got 2-3 hours a day at most to play this is a huge difference and something the player has no control over. Why not make it worthwhile for all players in the group when someone is working through the MSQ and has to do these?