why would you take care to NOT get coffee grounds into the sink/drain? Its a feature, the grounds remove some of that fat/etc. that builds up in any kitchen sin

why would you take care to NOT get coffee grounds into the sink/drain? Its a feature, the grounds remove some of that fat/etc. that builds up in any kitchen sink/drain. I myself just wash out my French press with water and let all of that go down the drain, makes it the easiest to clean. Not to mention there is no need for onetime filters like with many other methods (same for Bialettis/espresso maker)