From the OP: > I’m a fan of the Pareto principle: 80% of consequences come from 20% of the causes. This reminds me of the claim that most users only use 20%

From the OP: > I’m a fan of the Pareto principle: 80% of consequences come from 20% of the causes. This reminds me of the claim that most users only use 20% of the features of a given application. What is often forgotten though, is that different users will often need different 20%.