There may be a corresponding issue with farm equipment over here, but I suspect not so much, due to the smaller size of the industry & the farms, but it may be worth finding out…
The only other professions that I can think of off the top of my head are:
they have trouble cutting keys for proprietary locks, which is touted as a security “feature”, but of course, that’s bogus, since a thief who’s stolen your key isn’t going to bother to get a copy made,
- Motor mechanics:
engine management systems & other parts, supposedly for environmental reasons, but again, that’s bogus, because emissions can be tested.
… but they’re both a bit cliquey which may be an issue & I’m loth to get involved with poisonous legacy tech like internal combustion engines (although I’m sure e-cars have similar issues).
Let’s all scratch our heads & see if there’s some more we can come up with.