A lot of a baby's language pickup is also based on what other people do in response to their attempts, linguistically and behaviourally. Read-only observation is obviously a big part of it, but it's not "exactly" the same.
Right. But that happens too with ML models during training - the model makes a prediction given training example input, which is evaluated against expected output, rinse repeat. A single example is very similar to doing something in response to a stimuli, and observing the reaction. Here it's more of predicting a reaction and getting feedback on accuracy, but that's part of our learning too - we remember things that surprise us, tune out those we can reliably predict.
