Very few loops need any real tuning. For most of them, an incredibly wide range of value works perfectly well. Systems usually have a lot of slack in them.
It's hard for most field engineers to get experience tuning loops when there are so few opportunities where the time investment can be justified.
This is one of those cases however where field engineers who are around plcs all the time will say "oh I never needed that class" (process control theory) but they never needed it only because they didn't learn it, so they either don't see opportunities to apply it, or aren't assigned the task.
I think this happens in computer science a lot as well. You often can go your whole (very successful) career not needing something you didn't learn, because your career would have been different if you had learned it thoroughly.
It's hard for most field engineers to get experience tuning loops when there are so few opportunities where the time investment can be justified.
This is one of those cases however where field engineers who are around plcs all the time will say "oh I never needed that class" (process control theory) but they never needed it only because they didn't learn it, so they either don't see opportunities to apply it, or aren't assigned the task.
I think this happens in computer science a lot as well. You often can go your whole (very successful) career not needing something you didn't learn, because your career would have been different if you had learned it thoroughly.