Robert, I'm a little sick of AT folks saying that mail drops for food are dumb. I've used mail drops on 1000 miles of trail now, and I wouldn't do the AT any other way. I loved my food, I was glad to not have to worry about getting to grocery stores (not always easy), and I saved money by being able to buy in bulk, even after shipping costs. To me, my meals looked tastier and healthier than what people who resupply on trail were eating.
That said, there's no right or wrong when it comes to mail drops--if you want to plan ahead, go for it. If you want to resupply in stores, do that.
Here's the best AT planning advice I can give you: ignore any blanket statements that x (whatever it is) is good, bad, the best, the worst, dumb, or brilliant. What's best or worst is going to be different for every hiker.