Way back when, the rigor (or lack thereof) of calculus was a culture war issue. Bishop Berkeley famously argued the dubious foundations of calculus rendered it

Way back when, the rigor (or lack thereof) of calculus was a culture war issue. Bishop Berkeley famously argued the dubious foundations of calculus rendered it no more trustworthy than religion. So, there was external as well as internal motivation for mathematics to clean up its act. https://en.wikipedia.org/wiki/The_Analyst https://en.wikipedia.org/wiki/The_Analyst