It doesn't matter if it's a coincidence or not. The fact that it works out that way still plays to its convenience and "good feel" in the US.

Arguing that it's a coincidence isn't really relevant.

I agree with the poster further up: I'm more or less good with all metric units expect temperature. While I still "feel" all the US customary units better than metric, I can intuitively "see" meters, liters, and kilograms. But Celsius continues to elude me, even after dating and being married to someone for 8+ years who grew up in a metric country.