My understanding is that PID does not work as well for Mulitple Input Multiple Output systems compared with "modern control theory." See the "Analysis technique

My understanding is that PID does not work as well for Mulitple Input Multiple Output systems compared with "modern control theory." See the "Analysis techniques - frequency domain and time domain" and "Classical SISO System Design" sections of below Wikipedia article. https://en.m.wikipedia.org/wiki/Control_theory https://en.m.wikipedia.org/wiki/Control_theory