I've used PID at some very large systems. Main reason is simplicity - dynamic control is introducing huge amount of chaos to your system. Having simple algo lik

I've used PID at some very large systems. Main reason is simplicity - dynamic control is introducing huge amount of chaos to your system. Having simple algo like PID (that you need to tune carefully, and retune after each big change, true) has a big benefit - you can reason easily about behavior of the system. And for big systems, that's _extremely_ valuable property, that's often underestimated.