I don't think you understand how dodge vs accuracy works. When you have 30+ dodge, and your opponent has 75 accuracy, they have at best a 45% chance to hit (accuracy - dodge = hit chance). They don't have 25% chance to miss, they have a 55% chance to miss. This, by the way, is without any dodge traits or accessories. If you add in Lithe, suddenly you have 40+ dodge, and your opponent is down to 35% chance to hit. Toss in Balance or god forbid, Acrobat, and it becomes a dodge tank.
Take this build, for example:
Blood (20) + Warg (10) + Kite Shield (6) + Monk's Robe (5) + Lithe (10) + Balance (5) + Cloak of Night (10) = 66 dodge. Balance for ease of example, acrobat is usually prefered, 3rd trait = muscle for damage and weight capacity (an acrobat will go well into the 70s very easily).
Without Cloak of Night, and perhaps using a Round Shield instead of Kite for early game, you'd still get 54 dodge. Or 52 if you're talking about REALLY early game (with a Wood shield - although if you got warg, this probably won't be the case.) This is still more than enough, when combined with blind to take even the most accurate of units to 3% to hit.
By the way, your assumption that blindness strategy would work just as well without the dodge bonus, is ... well, rather off. Due to how dodge stacking works, the more dodge you can get, the more effective it becomes.
The 20 dodge at the end drastically changes how often an enemy will hit you. Take the above example, instead of 54 dodge, you'd have 34... an enemy that would have hit you 3% of the time, could be hitting you 23% of the time instead. That's roughly 8x the chance. Of course, that's a pretty extreme example, but I hope you understand. Certainly, 23% is still very good, which is precisely why it doesn't need the extra help to get to 3%.
Oh, and BTW: it's not that I don't like wraiths, it just feels completely cheap. Right now, playing Wraiths feels like playing Tarth or a custom super faction. Maybe I just like to have some challenge in my games *shrugs*.