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.