You're just moving the question from "confused" to "think", and I think you're also conflating "to be confused" (which was what I said) with "to feel confused" (which is a whole other thing.)

I guess my definition of 'to be confused' is something like 'to have a significant mismatch between your model and reality', so yeah, you could argue that a PID controller is "confused" by a workload with significant inertia. And 'to feel confused' would be 'to identify a significant mismatch between your model and reality', of which clearly a PID controller is not capable, but most multicellular life forms are.