And you know why the liter is almost useful? It's about a quart!
I sneer at the metric system because it was the French revolutionaries' vision for seizing power over everyday life. They also insisted on 10-month years, 10-day weeks . . . yes, you can't make it up. They tried make farm animals follow their schedule changes, too, but got uncomprehending, cow-eyed stares. What you see as the "metric" system today are the few idiocies the gnostic elites in Paris were able to make stick (like everything they decreed, under pain of death).
And just think: Robespierre was guillotined as well.
The good old French Revolution; the real birth of communistic revolution and a failure that collapsed in on itself.
The metric system’s forte is that it has a much better grasp on the concept of mass.