There’s Amish and there’s Amish. There are lots of them in S. Indiana, and you see them buying stuff at Walmart all the time. And no, they aren’t Mennonites-- you see them too, and you can tell them because they have prints on their clothes, and zippers and buttons) while the Amish use only dark, solid colors, and safety pins on their clothes.
Also, the Amish come to Walmart in horse buggies, no lie. They park them off at the edge of the parking lot, and come at low-traffic times, so no one parks near them.
But the Amish but sneakers-- you see women and children wearing them all the time, but not the men, for some reason. I think they buy tights, too. Not sure, but the ones they wear sure don’t look homemade. And disposable diapers. Maybe they buy the disposables only for trips, but they seem to buy a lot of them. You see them buying fresh produce in the winter sometimes, too, and they buy baking goods sometimes. I guess they mostly get stuff like that (flour and yeast) in bulk, but sometimes you run low right before a delivery, or need something special-- they have bakeries where they take orders from non-Amish for made-to-spec products.
Sometimes you see them buy the odd thing you wouldn’t think the Amish would get, but I suppose any port in a storm.
Once when I stopped for gas, there was a really large buggy outside the attached convenience store, and the family was inside buying snacks-- individual bags of chips, and Cheez-its, and bottles of juice. I guess there are all sorts of scenarios, from “someone stole the food they packed fro their trip,” to “They had a broken wheel, had to change it, and the trip took longer than they anticipated,” but these definitely weren’t Mennonites.
Anyway, I have had some conversations with Amish from time to time-- the purpose of eschewing modernism isn’t because there’s anything wrong or bad about it per se-- it’s just that too much of it gives you free time, and free time leads to temptation. The idea behind the lack of modernism is that everything takes so long to do, you have no time or energy left to do anything sinful.
So basically, you do what you have to. They can have AM radios for things like weather reports, so they can protect crops. They can have all manner of modern equipment when it’s a medical necessity. And when they go out in the world, they don’t have to walk up 20 flights when there’s an elevator. 20 flights is more to ask of someone that what is “natural,” or necessary. I can’t come up with quite the right word there-- but no one is going to sin due to the time saved not walking up 20 flights on a one-time outing to the city building for some kind of permit.