See PID controllers.
A long time ago in a distant galaxy, i used to build for power generation and control systems (coal/gas/nucl/desalinization) stringing together primitive math and logic functions with canned op-amps and so fourth.
That airfoil is quite impressive; the other examples seem to look like actively-biased lissajous pattern/deflections.
See https://ifac.papercept.net/conferences/ ... Web_3.html
As for "So they can do far better in any practical application"; I am 99.46467546754765476546457% sure this is not so!
- Analog lightspeed response
- Digital DAC Quantisation Error
- Form Factor: Analog size vs Digital's computing on the head of a pin and on and on...
However if given a choice, of course a digital computer solution is typically simpler to design, smaller, and cost effective!