1. It's overpowered.
No, it's not. The OP argument is pancakes because removing a feature does not balance it. I understand the need for a drawback to dual wielding, but strictly prohibiting a player from taking any sort of blocking action is silly. A combatant holding two swords is just as capable of holding them up defensively as someone using one sword or a shield. There's no physical or physiological reason that blocking should just be "deleted." Obviously it needs to be less effective than a shield, or even a single weapon block. Perhaps it needs to have almost no effect, I can understand that. But a lack of balance on the part of the developer doesn't mean that the ability should just go away. Example, Shield block 100% effective, Single Weapon block 50% effective, Double-Weapon block 15% effective.
That is balance. The "Delete" key is not.
2. The animation doesn't exist.
That's circular. The only reason there's no animation is because they didn't include the ability. I'm asking them to put it in, animation and all. Crossing the weapons comes to mind.

