Why is this research? Everyone knows that software can control fan speed either directly with commands or indirectly with load. Everyone also knows you can hear

Why is this research? Everyone knows that software can control fan speed either directly with commands or indirectly with load. Everyone also knows you can hear the sounds fans make and microphones can pick up sounds or vibrations. It seems to be just a mundane engineering job or hobby project. Maybe there's some value in getting a higher bandwidth or longer range detection or whatever, but the basic principle is too obviously true to need to be proved.