I think you make a very good point. The D&D wizard, with his books and experiments, is a lot like a scientist, whereas the psionicist doesn't need books or objects or any kind of civilization.
You're going too far here. Prospero, from Shakespeare's 'The Tempest', is a book-learning sort of wizard. Atlantes, from medieval French romance, foretells the future with his Book of Fates.
I'm no Shakespearean expert, but the second example isn't a D&D wizard, it's someone who's using an artifact. He's not using written down formulae inside his book or waving around bat guano to create fireballs.