[KenWittlief]

Einstein said "Everything should be as simple as possible, but not simpler".

KISS is in line with this, but dont take it too far. Some engineering concepts and esp control systems are complex, but the improvements they can provide are well worth the added complexity.

Closed looped feedback on steering or motion control is a good example. With a yaw rate sensor and a simple PID control loop, you can make a robot steering both highly precise, and highly responsive, compared to feeding the joystick commands directly to the motors.

Simplicity of design gets you some very important characteristics: reliability, repairability, easy to fabricate and assemble, low cost, quick 'time to market'

but simplicity must be balanced against performance, precision, accuracy, and ease of use and driver control.