I definitely support this idea. Early levels/gear could have simple Traits like +2% damage increase, +crit, +strength, etc...

Assignable traits could also be limited 1 for every 10 levels so it doesn't become super unbalanced. I would even think that multi-class/job gear could give traits that work for each class/job that can equip said gear. So DoW gear could give traits that ALL DoW could use.

Then as OP suggests, AF and JSE could give class/job specific traits.