Physics started as metaphysics. This is far from an isolated case. The question of verifiability is a part of our understanding of the nature of language and truth . This is known as the reflection theory of language. Language, like a mirror, creates certain images, reflections of the things around us.
Falsity is a wrong, distorted reflection.
In particular, to create images which correspond to no real thing in the world is to be in error. With this concept of meaning and truth, any expression of our language which cannot be immediately interpreted in terms of observable facts, is meaningless and misleading. Such a view, however, is unacceptable for science. Electromagnetic field has still less of reality. And the situation with the wave function in quantum mechanics is simply disastrous.