TIL; can't remember ever hearing about them before, where are they used? But it seems like we finally agree on something, simpler approaches to AI that predate

TIL; can't remember ever hearing about them before, where are they used? But it seems like we finally agree on something, simpler approaches to AI that predate neural networks are still potentially useful. Because you're not going to claim that ML is the only useful kind of AI, are you?