The Bourbaki group was reponsible for the Mathématiques modernes movement which intended to reform basic education on rigorous math. This may be the world's best documented educational failure in history. It was tried in several countries, so the sample size isn't one. All evidence points at rigor as a terrible educational tool.
The point of Math education isn't to create a clone army of the most pedantic pure Mathematicians in Academia.
> if you really think it's so effective when many demonstrate a lack of understanding all around us. That so many struggle with calculus is evidence itself
Because the first attempt went so well.