Dual Wield Convention Makes No Sense To Me

[Estu]

It's badly-worded. What it's trying to say is if you can have any two weapons you want, you want to have a low-delay weapon in your main hand (to capitalize on damage bonus) and a good ratio weapon in your offhand. In your hypothetical situation where all you have is two weapons with the same delay but different damage, you of course want the better weapon in your main hand, because you'll be swinging with it more often (primary weapon always swings, secondary weapon only swings upon a successful dual wield check).

I've just added some clarification to the Wiki page.