Why don't quests reset on class change?

[Neasa]

Your options? Grind limited leves (6 per day), grind fates or grind dungeons. Dungeon queues are horrible as DPS and fate grinding is not even really playing the game; it's sitting in town waiting to venture out for 30 seconds to mash some keys.

Well, you could actually make some friends and bypass the queue, but you don't seem very likeable.