Now let's imagine D:OS with dual-wielding. Rogues would now be dual-wielding daggers, which means Rogues would have to be balanced around this. This would mean that a single dagger in the hand would no longer have approximate two-hander power. This, in turn, would mean that Str/Dex hybrids have less to offer players, because there's nothing special about actually getting to use that off hand slot anymore.
The problem actually doesn't exist at all.
One handed weapons wouldn't have to be rebalanced.
It's quite simple.
When wielding two weapons you are less accurate and/or deal less damage per hit,
but you attack faster (each swing costs less AP).
This is not anything revolutionary or unheard of.
