US thread patterns are a bit better the the metric ones
Very interesting. Not directly related to measurements but a clear practical reason to chose imperial over metric. Cups are also a more convenient measurement for dry, equally dense ingredients.
neither system is head and shoulders better than the other
Metric having intersecting definitions (1l of water = 1kg) and being divisible by 10 have clear advantages for mental arithmetic. But if imperial were consistently base 12 I could be convinced to swap.
Why doesn’t the metric world use Kelvin to measure the temperature in daily use?
It sort of is. At least the scale is the same. Only the base value differs.