Is tai chi just form?

Form is just 1 area of practice in tai chi.

8 areas of knowledge and ability provide a balanced comprehension of the art:

1. Qigong (energy/breath work)
2. Form
3. Pushing hands
4. Meditation
5. Theory & philosophy
6. Martial skill (kung fu)
7. Neigong (whole-body strength)
8. Instructing (optional)

A tai chi student should work towards competence in each of these areas and also uncover the essence of the art.