It often happens that people do their best work under the pressure of adverse circumstances. Madison’s Notes on the Constitutional Convention give the clear impression that the Framers were determined to get things right and knew that they had little or no margin for error.
Klarman does make the point that the Founders were truly the elite, highly-educated of their day, but that they were truly public spirited, determined to “get things right” as you say. The general elite of the day (lawyers, doctors, etc.) overwhelmingly supported ratification.
Contrast this with today where the elite, highly-educated are often viewed skeptically, if not with disdain, with whom we would NOT trust with re-working our government.