[maartenh]

It's what you're used to. Cups and gallons are confusing to me!

In some of my Dutch cook book, there are mentions of cups. But mostly as a relative unit; add one cup of X, two cups of Y.

For absolute amounts, the metrics system just makes more sense, as it nearly combines the different quantities without weird conversion constants.

Note that in medical or scientific environments, centiliters are actually used.

But then again, we still use milimiter-mercury as a unit in medicine too ;) [0]

[0] https://en.m.wikipedia.org/wiki/Millimetre_of_mercury