A software developer needs to understand the functional designs, technical designs, architecture, and test plans that are relevant. Being able to produce functions is not enough. In a machine learning context knowledge of the concept and mathematics are required. ChatGPT is a level higher than a Markov chain. It has a sense of which words and groups of words go together. But for it words are just lists of numbers. So in fact it evaluates nested functions with vectors as input. For a much smaller network, you can do the same thing in excel.