You're missing the fact that you actually DO attack faster with 2 weapons and you also are missing the fact that you don't own skyrim nor have you played it nor have you seen the gold version. All you have heard is speculation exaggerated by an excessive amount of gamer previews.
Also, no one has talked about the duel wielding perk tree. There COULD be a perk which allows you to swing both weps simultaneously
1. There isn't a duel wielding skill why would it have a perk tree? Skills have perk trees not random stuff you can just do. That has been announced.
2. I'm not laying down the law and saying it is useless and bad. I'm saying the information they released so far is lacking any evidence to get me excited. When I hear about it I more wonder if it will be balanced. Was in confirmed you attack faster in you dual wield I can't find that data. Either way I'm not saying it's useless BECAUSE I don't own skyrim and it isn't released yet.
3. I didn't hear speculation though. I'm following released information an d preview plays and data from them. it is confirmed with this when dual wielding only one weapon attacks at a time. It is confirmed the perks are part of skills which means there won't be a dual wielding perk tree because there isn't a dual wielding skill. There is a one handed perk tree and everything in that tree is confirmed and nothing in it says attack with both hands at once.
if attack speed is increased in general then it gives a purpose. but that was a piece of confirmed information i missed.