Ironically in the context of the original article, it's precisely when you're trying to support IE 5+ or 6+ (or even more modest goals) that less/sass is really

Ironically in the context of the original article, it's precisely when you're trying to support IE 5+ or 6+ (or even more modest goals) that less/sass is really valuable, since you can generate chunks of CSS values with all the browser prefixes/hacky workarounds/etc, and still be able to think about things at a higher level.