For the screens I’m using, a book page is way narrower than the standard text region of a screen.

Got any details on the type of stuff your mom shared for improved UIs?

It makes more sense on monitors with large blocks of text or large paragraphs. With a monitor so big relative to a book, and scrolling making it easy to lose where you were, it can sometimes be tough for folks to read through huge chunks. Some people select chunks of text to help break up those monoliths into manageable bites along with putting a clear marker for where they are if they scroll or otherwise lose their place…