Adding Stances

[Rivinhal]

So we agree that no one wants to be in a dungeon for too long a time.

However, in order to clear a dungeon in a reasonable time frame, I can assume that the fastest way to clear a dungeon is with good, optimal dps?

Generally... But very few people are capable of fully optimizing their DPS.
In a casual setting, as long as you're trying your best, most people will be content. Optimization isn't really a concern.