As an academic, I fairly resonate with this message. Also notice that most examples he noticed are from academia/science endeavors. I see academia as probably the only place where slow projects are expected and even encouraged; think of PhD students working on basic science problems, often supported for 5-7 years at end (of course close to minimum wage).

This is not to hide that all slow undertakings are good or anything. Often because of inefficient executions or bureaucratic hurdles, academic suffers. But, I am trying to highlight the observation that how a slow and steady progress is the typical modus operandi for an academic lab/group. A famous saying comes to mind: Rome isn't built in a day.