Yes the main problem is spending a Fighting Style and a Feat on Dual Wielding, and then actually using your Bonus Action for something else entirely half the time. Classes have many useful BA's (and will have more later), and Larian have now made this issue even clearer by turning Shove, potions and Hide into Bonus Actions, to name a few. That's why I wanted to raise the topic. Larian's changes have a ripple effect in the system and I'm not sure they care whole lot because they prioritize their own homebrew so much.
I don't think saying it's half the time is fair.
If you really analyze the game play and consider the weapon choices being made, I think you'll find that dual weapon fighters are using their off hands more than you give them credit for.
The second issue which is not apparent in EA yet is that Dual Wielding does not progress with levels. As martials get extra attacks, the worth of the off-hand damage decreases.
I can't speak for this. I'll have to wait and see what Larian does with dual weapon fighting as levels increase.
For what it's worth, I don't think we can predict how Larian is going to handle this.