Laurefindel
Legend
The thing that bothers me about two weapon fighting is that it shouldn't provide extra attacks. That isn't why it was done in the real world.
I partially agree, but the "defense" option in D&D is already covered by the shield. TWF could be made into a active defense mechanics, but that would quickly become cumbersome in play. Mechanically speaking, there is a niche for an extra attack that TWF can fill.
I've considered turning TWF into either a riposte mechanics (Enemy attack misses: you successfully parried the enemy's blow, creating an opening for a reaction AoO with a light off-hand weapon!), or a feint-type mechanics (Your attack missed: that's ok, that was just a feint. Now comes the real intended attack with the light off-hand weapon!)
The former would change TWF's place in action economy from Bonus Action to Reaction while the latter turns TWF into a damage-dealing insurance policy rather than a way to up your DPR.
But every time I think about TWF, i run into the (perceived) issue that there is no point whatsoever in fighting with an empty hand, which is also a popular concept in pop culture (Erol Flynn-type duels, muggers with a short club, assassins with a (single) dagger, etc.)