Olrox17
Hero
Yes, but the off-hand is used for balance and support in rapier combat, there clearly is a benefit in keeping an hand free. The versatile feature would be a simple way to represent this.rapier is exclusive 1Handed weapon, I don't see how you could 2Hand it with effectiveness.
Of course, you could make a unique feature for the rapier that increases your damage die if you keep a hand free while attacking with a rapier, but that is functionally identical to what versatile already does.