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I think most engineers have an understanding amongst each other, regardless of their specialty, we can all teach ourselves to problem solve. So many math and physics classes as an EE just to get to my core classes. It definitely a certain type of person to get through the thick of it.
Major engineering organizations, like the IEEE or the ASME, often require degrees, but do have exceptions built into the rules for on the job experience. So this does happen, and regularly enough that there’s consideration for it.