Naoki Yoshida's Comment in Regard to Jump Potions/Boost Potions

[szalkerous]

Class quests hammer nothing it while leveling, you don't even HAVE to do class/jobs quests to reach level cap...

You're missing the point. And yes, they do hammer the basics. If you're an experienced or skilled player from day one, then maybe they didn't do much for you. But they're designed to teach a complete noob what that class is used for and it's strengths. Some new players don't know what a tank is, or what a healer HOT vs. a cooldown is, or what MP starvation is.

Yes, you don't need to do class quests currently. But you do have the option to go back and do them if you desire.

this potion will complete all job quests. You are denied the ability to go back and do them.