Sure, you can model humans as controllers that receive some reference and track it, just as you can model a human as a set of "if-then" loops, but so what?
The difference is that humans are not like control systems, they are control systems, and are not and cannot be modelled as sets of "if-then" loops, whatever those are supposed to be.
How would that model do any good compressing our description of how human minds work?
That presumes we already have such a description. PCT provides one. It provides the possibility to obtain actual understanding of the matter. Nothing else has yet done that.
And if people are control systems -- that is, they vary their actions to obtain their intended perceptions -- then that implies that the traditional methods of experimental psychology are invalid. Correlating experimental stimuli and subjects' responses tells you nothing. Here's a psychologist writing on this, the late Philip Runkel.
The difference is that humans are not like control systems, they are control systems, and are not and cannot be modelled as sets of "if-then" loops, whatever those are supposed to be.
Er, isn't that the "program" level of Powers's model? IOW, his model shows how you can build up from more fundamental control structures to get complex "programs". See chapters 13-18 of Behavior: The Control Of Perception. (At least in the 2nd edition, which is all I've read.)
Transhumanists have high hopes for enhancing human cognitive abilities in the future. But what realistic steps can we take to enhance them now? On the one hand Flynn effect suggests IQ (which is a major factor in human cognition) can be increased a lot with current technology, on the other hand review of existing drugs seems rather pessimistic - they seem to have minor positive effect on low performers, and very little effect on high performers, what means they're mostly of therapeutic not enhancing use.
So, fellow rationalists, how can we enhance our cognition now? Solid research especially welcome, but consistent anecdotal evidence is also welcome.