You won't understand the bandwidth argument if you take bandwidth too literally.

Have you ever picked up a magazine because it had a tantalizing "blurb" on the cover, and then you spend several minutes trying to find the matching article—because the blurb didn't give the page number, and the table of contents is hidden behind several pages of advertising, and then the titles of the articles are quite different from the phrases on the cover, so that it's difficult to find a match; and even after you have figured out the page number you want, it's still hard to find the page because most of the pages don't have numbers, because page numbers would spoil their lovely advertising layouts—and then when you finally do find the article, it's a big disappointment?

That's a waste of bandwidth.