Sadras
Legend
And, if you actually want to use stats for commoners, it gets REALLY wonky. Why is EVERY smith massively hugely muscled. Sure, smiths usually are big dudes, but, not necessarily the biggest dude in town every time.
Agree with everything else you have said @Hussar, but if my memory serves me, couldn't you allocate more than 1 proficiency slot to a skill. So for instance your smith has 12 STR, but has invested 3 additional proficiency slots in weaponsmithy (after the intial proficiency buy), therefore it would be 15 (12+3) in the skill. So he could roll 15 or lower. Am I remembering correctly?