I also have an Amish farrier. I got so tired of losing my farrier every few years. They would quit because of a bad back, or go to a different job--I wanted someone who would keep at it as long as I kept my horses. I paid them all on time, no bounced checks, And, my horses are ALL good with their feet!! ...go figure...
After a year of my DD and I both working on one foot at a time--how many of us does it really take to "change a lightbulb"--I found this guy, about a hour away. He also trains riding/driving horses. I don't think you can claim that they are all good or all bad. For instance, I bought oak chairs from an Amish shop, and they're falling apart. On the other hand, I waited 6 months for an appointment with a comptetitor of my farrier years ago--he was VERY FAST, VERY ACCURATE. Mine is very accurate, but it takes a day to shoe all 4 horses. He's picky. BUT, he's also a good trainer. We've been doing business with the Amish for 25 years now. They are slowly moving into the 19th-20th century. In the 1980's they didn't even use telephones, now they have answering machines.

By 2050, I think they'll be driving cars. I know that my farrier has his eye on my Cummins diesel, 4-wheel drive, doolie!!