In grad school we students had access to a small machine shop that we could use without supervision and without any serious training (in retrospect, it’s bizarre that this was allowed). For major hardware fabrication we’d come up with drawings and send the job out, but for smaller stuff, we could just walk into this shop and do it ourselves. Having learned there how to use an ancient mill and lathe with no CNC capability (and at first, no digital readouts), it soon factored into my thinking about how to design hardware for fabrication: you start to think about how the piece will be held while machining, how rigid various sections need to be to tolerate machining forces, how tight a tolerance you really need on this surface or that (since you know how difficult it is to obtain a given tolerance), and so on.
It makes sense that tradesmen who are the true experts at their job should primarily be the hands-on folks, but a design engineer (whether electrical, mechanical, or otherwise) who has never experienced the fabrication or service side of things is more likely to produce shitty designs that are a pain to make or use.