Tony Vargas
Legend
I don't find the rogue and fighter quite worthy, individually, either - You could combine them and not have an overpowered class.I think "one who has control of their ki" is conceptually different enough from the Fighter or Rogue to be it's own class.
Second Wind and Action Surge tap into and direct an inner energy. Calling that Ki instead of second wind or CS dice is just orientalist baggage.. Fighters are mundane warriors, Monks are taping into an inner energy that Fighters have no direct control over. Maybe Barbarians are taping into it too, but in an uncontrolled sort of way.