Belaboring the point: you should have SOME working understanding of the physics of your homes use of energy. You should be able to fix your home when something’s wrong with it, so long as it’s not something catastrophically wrong that requires professional help (such as the fire brigade).
The point: computers are different from everything else. Pre-writing man is a fundamentally different character to literate, historical man. (I do believe there’s an Egyptian dialogue on the matter.) And in the same manner, computing man is a fundamentally different character from pre-computing man. However, most people, despite their USE of computers, cannot really compute, because they can only get their computers to do what other people have told them to do, and not what they themselves have told their computers to do. In other words, to them the computer is an appliance. Now, not everyone can read Ulysses, or Durants history, and I don’t think it would be fair to expect that of people. But most people can read, and they can read the whole book if they choose. The qualitative shift of computational man finds that what he has read can be made into action, simply by it having been written, yet this does not hold true for a person who is handed Durants history of the world, or Livy’s history of Rome (before having been taught Latin, even!) and being told, you have knowledge, even though you can’t get through it all.
You start people with shorter books. Even picture books. You start them with simpler computers, with simpler software, and then more complex computers which do more complex things. And even in the professional world, of fully literate adults, you only break out the really complicated stuff for the really complicated things.
Software should be comprehensible, because it is meant to be comprehensible, it is not just execution but elocution, and is the explanation of its own intent.