Mouseferatu
Hero
That would be a funny way to balance it since you could just go Dex based Duelist with a shield and still do more damage than a TWF with the same benefits and higher AC.
How do you figure more damage? IIRC, the duelist style gives you +2 to damage, right? And dual-wielding style lets you apply your modifier to the off-hand attack.
Let's assume 16 Dex for both. So, wielding a rapier, it's 1d8 +3 Dex +2. Averages 9.5.
Dual-wielder using two short swords or scimitars, 1d6 + 1d6 +6 (Dex twice). Averages 13.
Duelist has better AC, with the shield, but the dual-wielder has not just higher average damage, but a chance to at least deal some damage if the first one misses.
I think it's a fair trade. Or am I missing something?