You know what, I'm going to go ahead and say an extraverted judging process would be nothing without an extraverted perceiving process along for the ride.
Or maybe I should limit the claim to Se as used in NTJs and NFJs: both Te and Fe would be nothing without Se along for the ride. Both Fe and Te reach out into the world, but, to use a metaphor, you can't reach without fingers and arms.
Sure, Ni gives you lots to do by yourself, but without the Se in the mix as well, nothing would come to nothing.
I don't know exactly why I think this, but I do think it. Something about how if you don't have a sensing process somewhere in your makeup, then you would never find yourself in your own body or in the world.
It's the S is all of us that means we are, in a concrete real sense, here. Present. Alive. Part of the world.