A form cannot be taught correctly to a beginner.
It is taught in accordance with the students ability to learn.
Beginners are physically incapable of the sophistication required to practice
the form correctly, so a cruder version of the sequence is taught at first.
Once the exaggerated sequence has been learned, it can be made smaller and
subtler.
Most movements will be altered as the student progresses and their body becomes
more receptive.