FrogReaver
The most respectful and polite poster ever
Suppose there was a -5/+10 feat for dual wielding. Then Dual wielding would basically be equal to polearm mastery + GWF. If you want to fix dual wielding I think you need a feat like that.
Now if you are playing in a featless game then TWF has some overlooked utility once you reach extra attack. You can start using the first attack in your sequence to attempt to prone an enemy and still make 2 attacks. You lose a lot less trying this than a PC that only has 2 attacks and no bonus action attacks. I'm don't think it makes up the full difference but it very well could at times.
Now if you are playing in a featless game then TWF has some overlooked utility once you reach extra attack. You can start using the first attack in your sequence to attempt to prone an enemy and still make 2 attacks. You lose a lot less trying this than a PC that only has 2 attacks and no bonus action attacks. I'm don't think it makes up the full difference but it very well could at times.