The extra Bonus Attack on the Thief that helps make dual wielding viable needs to be removed. That is not the correct answer.
Mostly because other classes and subclasses need to be able to dual wield as well.
But also because extra BA's open up new problems. Drinking an unreasonable amount of potions to tank a hard enemy. Using powerful stuff like Wyvern poison or smites spiral out of control when you get extra attacks.
I agree they should already change how dual wielding works in BG3 (as per the One D&D playtest material) and get rid of the Bonus Action requirement.
It's important to keep in mind that in 5e D&D, not every class is meant to benefit from dual wielding. Only Rangers and Fighters get the two-weapon style to use it.
dual wielding changes in future dnd editions, but dual wielding 5e overall isnt that bad. It has strong interactions with multi attack buffs. It beats two handed weapons easily unless you have a great weapon master or sharpshooter build with high attack, or easy advantage
And if you multiclass Fighter or Ranger 5 -> Rogue, it can remain fairly competitive even with feats.
