[IAmBroom]

It also suffers from an attempt to perfect something ruled by a "Bathtub Curve", that is, a curve with two steep or asymptotic, undesirable boundaries and a broad, roughly equivalent "acceptable zone" in between. (Imagine trying to find a low point in a bathtub to sit at. Probably 90% of the top surface of a bathtub meets the criterion of "low", and no one really cares enough to sit at the lowest point.)

They don't even provide numbers - does their method save 1% of the coffee? Even saving 15% of the coffee used is not very significant, especially if the make-process is difficult to get right.

This is an article begging to be summarized by a headline like "Scientists have discovered how to stretch your coffee budget!".