Earlier quoted context omitted.
A related anecdote: There was for a long time, a history of students in certain disciplines such as physics and some areas of chemistry, making their own tools and equipment. My dad had to build an NMR as part of an analytical chemistry course. I built an exceptional amount of gear for my graduate research project. Of course there's the bit about using cheap labor. But a side result is that you have a chance of actua…
That might have more to do with 1)students being cheap & 2)researchers often needing custom equipment that is unavaliable commercially. I know the justification given for undergrad chemists learning glassworking was the expectation that as professionals it would be a required skill.
In my own case it was because instrumentation was the thing that I was ultimately interested in, and the expertise that I developed in grad school got me going in my career. The stuff that I built was on top of the roughly half million dollars worth of commercial equipment that I used.