[Matticus_Rex]

It depends on what you do. I read about mental models for a long time before any of them became useful for me. Working at a startup right out of law school there were a few that were relevant for my job, but nothing earth-shattering. Years later in a different job where I make a lot of business decisions, consult internally on marketing strategy, and deal with a lot of metrics, I use a lot of the specific Farnam Street-style models constantly.