I don't think HVAC professionals is a good analogy, this is a much more narrow discipline than computer software. Construction workers or architects might be a better analogy, but software is really a world of its own.

Other crafting disciplines don't have super-complex tooling that goes through massive paradigm shifts every 5 years, with work on the same tools and products happening across continents, and where learning the inner workings of each iteration of these tools can be career in itself. Things move much slower in the physical world, and it's likely that other rules apply to such a domain.