OP works in a diesel repair shop. These aren't mechanics like the local tire and repair shop. My experience with them is from the first 30 years of my life as a

OP works in a diesel repair shop. These aren't mechanics like the local tire and repair shop. My experience with them is from the first 30 years of my life as a full time farmer. They work on yuuuge machinery sometimes. They also do field work when the machine can't come to them. More often than not, these things have to take place at the shop because there are specialized diagnostic and other tools (like a mill or crane like OP says). These are not portable pieces of equipment. So your analogy sort of falls flat there. It would be like the server master (made that up just now and I like it). That person may not be able to work from home, because the physical machinery is important. Otherwise, yes, your point of teaching youth is important.