Good points. However some components are impossible to repair even if you are the manufacturer. We were developing a processor where it was very iffy if we could remove it and remove the heat sink in order to test it to figure out what went wrong. Got canceled before we had to deal with it at least.
Oh yeah. Tech is fragile. People do not appreciate that things now are kept running not by repairs but by replacement parts from overseas (that may require a certain password, not to mention a functioning GPS satellite network and god knows whatever else it takes to launch a container ship.
When people talk about how quick farming is going to bounce back in a post-apocalyptic scenario, I immediately think of this article: Why American Farmers Are Hacking Their Tractors With Ukrainian Firmware.
I think a post-apocalyptic scenario, the Amish and Mennonite are going to be really popular, since for the most part, their lifestyle will be unchanged. Perhaps they’ll be training others in the old ways of doing things?
I mentioned above that places with widespread subsistence farming or hunting-gathering probably will more or less get on as they always have. There may be famine related to climate change or loss of some key farming input, but this is nothing new for subsistence farmers.
The problem with the Amish is that they’re surrounded by people who wouldn’t be able to feed themselves, post-apocalypse. Starving people likely will be too desperate to patiently wait for the next harvest, or to learn how to farm. They would probably eat all the stored food, seed corn, farm animals, and the Amish people themselves.
You may find that a bit extreme, but people can only live like 50 days maximum without food. People in first-world countries are fed almost entirely by global food distribution systems, which I think we can agree won’t be back online for years. A mind-boggling number of people will die of starvation in the first 3 months post apocalypse.