[rayiner]

Reflowable text is fine for conveying information on a tiny screen, but that’s about it.

When your screen is bigger than a page, reflowing the text is almost never what you want because long lines are hard to read. Thus even though computer screens aren’t limited to the size of a sheet of paper, you want to wrap your lines at paper-width (or better, book width) anyway.

Note that programmers typically define an effective page width for source code by enforcing an 80-100 column limit.