So as a second part to my wall of text, I'll also examine how new weapons and jobs would be feasible in this system.

Adding a new weapon (example: guns)
1h version: Pistol
2h version: Musket
Add unique combos for the weapon
Add unique traits for the weapon
Add weapon exclusive abilities
Add non-exclusive abilities
Determine what proficiency in the weapon each Job should have


Adding a new Job (example, beastmaster)
Determine overall theme (pet class)
Determine Job Abilities (taming monsters)
Determine Job Traits (Bonuses to pets)
Determine weapon proficiency levels
(125% Axe, 100% sword,polearm,fist, 75% bow, elemental weapon, holy weapon)