Beseeching Daas Torah is an essential tool in navigating through shidduchim. How often to people call up their rav with questions about kashrus, chumros etc. Is Shidduchim not at the very least equally important?
Besides the fact that someone who has substantial daas torah is generally able to see the any situation in an objective light, and therefor, evaluate the situation appropriatly, there is also a tremendous sense of Menuchas Hanafesh one feels knowing that the decision they made, was made with the advice of daas torah. As hard as it may be, you can go to sleep at night, knowing you did the right thing.
if for no other reason than this alone, I think it is important to consult with daas torah.