Well, mstingray you may think that, but there is nothing in the rules that say that! The only thing we have to go off of is that the Chainfist follows all rules for the Chainfist- doubles strength, strikes at I1, and requires a second one to gain an extra attack.
Since a DCCW is a Power Weapon, and not a Power/Chainfist, you neither strike at Initiative or gain an Extra Attack for having 2 CCWs.
Does that suck? Yes
Is it a poor choice? Yes
Was it intentional? Probably not
Do we have to live with it? Yes