No one should consider becoming a teacher until they have something to teach. Many tai chi classes are tutored by people who have seen a fraction and believe it to be the whole.
Teaching people a fragmented view of tai chi is deceptive; it denies the student the richness of the complete art.
No matter what the style, tai chi practice must always contain the tai chi principles.
The principles are what make the art 'tai chi'. If your teacher does not know them, they should not be teaching anybody.