Not sure what the author means by “knowledge work”, but I find this very true, for any type of work.
When stuff is visible and tactile, folks assume that they should intuitively understand it. So my work is subjected to endless critique and brainstorming from everybody, including managers.
Sometimes I envy the embedded systems people because nobody ever looks at the innards of their designs.
True, but the flip side is that nobody understands the complexity. Some will assume it must be easy, especially if you keep quiet about the challenges and just deliver mostly good stuff.
To your point, I was working on a hybrid system and one meeting dragged on because marketing was upset that the font was changed on the inverter. It was machined into the case, and they couldn't make the sharp interior angles needed. So yeah, even when you can see it, there may be hidden complexity.
I've actually seen a few customers listing it as such (based on some sales estimate), but it doesn't seem common. Which is a bit weird, especially in cases where you can trade software cost for hardware cost.