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For the same reason that we're all still on 12 months, 30ish days, 24h, 60m, 60s, 1000ms time.

When you put it like that, it's a bit weird. Is there an imperial fraction of a second that somehow never caught on?

This is because our system of time is based the earth circling the Sun and works best for things to slice up a circle, 360 degrees, base 6.