I think both Ti and Fi are kind of applying the theoretical and/or internal on to the world. I don't know where objective or subjective really begins in any of them. Se could be perceiving the objective potentials of a given situation, but they might use Ti to leverage it in a new way. Ni might see potentials as well, but control how they enact it with a utilitarian Te outlook.. just using whatever outside options are available, as they are.
Someone else could probably articulate it better.