It is a defensive posture against the mafia. Netflix is already bent over backwards as movie distributors try to run it into the ground with overt contracts, so they force them to use policies like these because they have the backwards idea that sharing will go away when they put their fingers in their ears and go lalalalala you don't exist.
But if you offer a link to any Watch Instantly-available film in the same frame as the torrent links, I think that would be great. Same with Amazon's and YouTube's streaming movie offerings.
Anyway, linking to Netflix/others is nice in theory but clutters the interface. Until we find a good solution for that, we won't do it.