The same reason even people who should know better implement all sorts of insane things in Excel. It's the tool available to them that they can find tutorials on using. With GPT it even seems like it's doing work for you.

Obviously anyone who knows anything about control systems immediately has five or six reasons why this is terrible, but in the meantime My First GPT is running lawn mowers from the sketchy discount shop because none of those people even knew how to ask.