I'll let you in on a little secret in the field of AI as someone who's job is AI (computational linguistics); AI is, and has always been, mostly just a fancy word for algorithms, a bunch of if-else/switch/match statements. It doesn't have to be complex...

That being said, you're underestimating how much engineering would go into a program that calculates the groceries you need to buy and where/when. Especially so if it's supposed to be automated, e.g. you're not just putting in how much bread you have currently every time you use bread.