Speaking as a writer, the imperial system shows its advantage in language. Imperial units tend to have fewer syllables, and are much punchier and easier to work with, while metric units, kilometer in particular, can be extremely awkward or cumbersome to use in a lot of situations. And then there are the many common phrases based on imperial units. "Give them a centimeter, and they'll take a kilometer" is comparatively not a pleasant phrase to read, write, or say, and even one as simple as "inching along" is valuable for building good sentences.