Returning Player confused with repeating quest

[Iscah]

Is your current goldsmith still level 50?

If no, then yes, there is benefit to doing class quests.

I'm not following your logic. Crafters don't stop levelling at 50 and you need to do the initial quests to unlock later quests, which give EXP and sometimes new skills.

Why would you not want to do them at 50?