Not dumb, untrained or not yet sufficiently skilled in this particular area. While you bear some responsibility for getting up to speed, I would argue that it is still their issue if they are not providing the necessary resources. With something like lemmy, you are probably on your own for finding and making use of those resources. But I would be surprised to learn that those resources don't exist. I haven't looked, but there must be some kind of documentation written by someone and a community of like-minded people. Maybe even some tutorials.

That said, some people will always struggle with certain kinds of abstraction or multiple layers of abstraction. For myself, one thing that I find helpful is to view each layer as an API that I'm targeting or a library that I'm using. In those cases, you never really worry about how things get done in the background.

Do you really have any idea how the keywords that solicit user input work? Not likely. Even if you do, you still completely ignore the fact that you know it while writing a line of code that solicits user input. That is a layer of abstraction that you use regularly without even thinking about it. A good architecture allows the same kind of reasoning about your code.