An impressive result is an important means to the end goal of education, I fully agree. To that end stepper motors are a shortcut and there is not much to learn about open loop position control with steppers. On the other hand position control of a servo motor is rich in engineering concepts and the result can be better than with steppers it just takes a little investment in understanding the system and how to control it. Continue in your quest, you will see the incredible specifications of the components in the kit combined with your ingenuity can lead to a much more inspiring result to the layman after some perseverance. Note: much of the PID control details are not covered in the material but all the schematics and code are out there for you to play with if desired.