Imoen makes a very good point. If you do these quests once say as a lowbie lancer, will you be able to do the same quests as a lowbie conjurer? Or will you be using leves or getting into exp party grinds? If there are 3 different options to level, the more the better is what I say.

Per the questing argument, good game design is developing quests that have a natural progression along with your character. There should be some reward (just like in most FF games) for exploring a whole town and talking to every npc. I don't see any issue if some of these quests do not tell you exactly where to go but that you may uncover it further down the road due to your dedication to exploration and investigation. So I think both sides have valid points.

If a quest says go kill 6 hogs down by the lake and they also put it on your map, np. There should be a quest too when you open a secret door in a shop or house, you talk to an npc mentioning how they wish to be reunited with their brother but haven't heard where he went. Through your exploration and talking to everyone, certain npcs give you clues and maybe you find him a couple levels later and the reward is higher than kill 6 hogs.