Yes, most of the brain is a glorified microcontroller for running and interpreting data from a billion skin sensors and driving hundreds of muscle actuators, do

Yes, most of the brain is a glorified microcontroller for running and interpreting data from a billion skin sensors and driving hundreds of muscle actuators, doing depth and object inference from binocular images, locating sounds from the twin microphone array, etc. Language and especially reasoning is a very small part of it all.