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Best would be armorsmith and alchimist.
Alchimist is nice because you can craft for yourself relatively useful potions and foods.

Gemcutter, no need, gems are super easy to get at the trader for...

I wouldn't call it useless.

It's just that most crafted items are obsolete stats wise since khitai came out.
Still, i for one find useful to be able to craft a decent blue set on a new character,...