I have begun to study control engineering by several books and awesome youtube videos by Brian Douglas. I love them because they give me new understanding of math that I learned before but I still can not get the point of what actually control engineers do.
What is meant by systems here? I mean all examples always are just physical systems like springs and etc, but all of them are governed by physical laws and no matter how dissatisfied with output we are, we are not able to modify physical laws. And in the case of, for instance, mobile robots what do control engineers do? Deriving PID coefficients? I feel like missing the most crucial part of it.