Practicality. It's more convenient to read door and street signs, restaurant menus, name badges, ticket machines etc. etc. without going through a screen reader.

It's little effort for a large benefit. But anything you learn past middle school in formal education is a moderate to large effort for a small to neglectable benefit. And you'll forget it anyway if it is uninteresting and not useful in your daily life.

Anything interesting or useful in your daily life, you'll pick up by yourself even without formal education.

This same logic applies to all the upstream education. It's convinient to have a more limited calculator in your own brain, or better yet, the ability to simply see numerical properties factors, in a way a calculator doesn't replace. It's good when you can yourself understand the physics of everyday systems, or perform useful calculations about them. And if your work is indeed tied to it, it's good to know basic semiconductor physics, even if the ordinary person has a million more immediately useful things to study.

Knowledge is not a tool for answering the absolutely minimum questions you encounter in daily life, but a way of seeing the world. Reading allows you to use language in ways you could not imagine with spoken word alone, just as math or physics or computer science enable new ways of thinking inaccessible without intense study.

I don't disagree that this is all useful to have. My point of contention is that the effort required is not worth the time investment if you are going to forget about it in a few years anyway because you never needed it in your daily life.

Our brains can't hold infinite amounts of data and a lot of information will become inaccessible if not used regularly. This is also why most of us do not speak twelve different languages, despite this being a supremely useful skill that is relatively easy to pick up compared to semiconductor physics.