Hey Bennsky, you have partially answered your own question 🙂
1. Develop accuracy of SHAPE, the pitch change mechanism
2. It’s a very powerful psychological exercise to disengaged the body from pitch. The tendency is to really overblow when entering higher lines or stab notes so learning to find the correct SHAPE without engaging the body and merely using the compression from within the mouth alone is very important.
This is explained in detail as you work through the course.