While Port & steak are a common entree pairing, you don't hear about Port and seafood too often. But one can consider dry White Port to be an excellent way to incorporate more Port in your diet.
Seriously, we focus on Port that is red or tawny in color far more than discussions on White Port. But wouldn't White Port be every bit as easy to find food pairings, especially those with slightly less RS?
Your probably right that they would be decent with seafood. But I don't eat much seafood except for sushi once in a while, but I generally don't like shell fish. So I'll save my Port consumption for the red variety. Excepting some nice older white's of course