[Bryan Herbst]

The others have explained it pretty well-

The reason is because many teams lack the coding prowess to do a lot of that by themselves.

However, in my experience, truly implementing the code they give you well is the more challenging part. Sure they give you the code that runs the encoders and camera, but doing something with that data (and doing it well) requires a lot of time, patients, and know-how.

For example, last year they gave everyone the two-color camera tracking code. Yet even with that, very few teams were able to effectively follow the trailers.

And once you get some of that working, ask yourself what else you can do. The next step could involve PID loops. Some teams have even included ultrasonic or IR sensors, GPS devices, and more. There is always more you can in your code (with some electronic assistance) to make your job more challenging.