What kinds of devices are you referring to? (Remember, we're talking about the days before mobile was a big enough market to justify making mobile versions of websites.)
Do you mean Blackberries? I'd humbly submit that, from a business perspective, Blackberry support wasn't an important goal for many sites.
Or do you mean laptops? There was a long time when mobile wasn't big and just about every laptop supported at least 960px.
> You don't need to have text fill the entire width of the display to have a site work everywhere, I don't understand why you brought that up at all.
I thought you were suggesting that the pre-mobile, 960px technique was bad for large screens. It sounds like I was mistaken, and you're actually referring to smaller screens.