Here's an idea: Right Trigger/R2/Left-click attacks with both weapons and Left Trigger/L2/Right-click blocks. Problem solved. And it would not have been difficult to implement a new blocking animation for DW style.

Nord Warrior with Mage skills and Archery, i can't decide between 2hand or weapon and shield either.

I can tell from the recieving end 2h is a scary thing. A lot of insta kills possible. With shield you are the guy who blocks it or better yet not let the 2h strike at all ... and then hits with 1h from behind the shield. Wassup a shield in your face followed by axe in your face

One thing that is a bit strange is that for example I fought my first white troll at lvl 10, superior steel armor, perks in armor and blocking and the bloody mutant still 4 hit me through the shield. I had to let companion take the beating, she survives more than I do, and just slash&bash him from behind to disturb his attacks. Not sure if with 2h you can avoid being hit better.

One more thing ... if you like magic, 1h + spells seems to be totally viable. SW style

You realise how OP it WOULDNT be, right?

Think about it. Blocking blocks melee damage, arrows and magic, from what I've read here.

Dual weapon blocking would only block melee damage... Same as one handed weapon blocking. You'd still be ripped apart by spell casters and arrows...

All good, in other words. Only valid argument for lack of duel blocking is: "There aren't enough controls for it to work"

Animation argument is invalid. They are animations. It wouldn't be hard to animate a block where they cross weapons or do something similar, which though it may not work in real life would be utterly believable in a game.