They probably thought: "Hey, using two shields is kind of stupid, so let's not let them do that...considering they'd be useless in combat and stuff. And people would just complain on teh forums if we put it in....."
Given that we can put defensive enchantments on weapons and armour, I'd say we, from a logical point of view, could do without the inclusion of dual shields. Granted it does not make up completely for a shield, it will have to do, for now, at least...
Your logic confuses and upsets me.
I will now go write a 37 page rant that I will post (in full) at a later point in time.
In this rant I will do the following according to this forum's customs:
1 - threaten to not buy the game even though I preordered months ago
2 - say the game is broken even though I've never played it
3 - Bring up arcane lore at random that has nothing to do with what I'm complaining about
4 - start making things up about the game that may or may not be true (probably not) in order to support my position
5 - ??????
6 - profit