The JS ecosystem in particular, it really seems like it was built by people hell-bent on reinventing the wheel and making all the mistakes / paying all the costs along the way. It's a pretty octagonal wheel so far, but maybe they'll get there eventually.

Ecosystems aren’t built by any homogeneous group of people. They’re a sum of their parts. It’s not like there was a committee and that committee decided how things should work wrt wheel reinvention. People publish packages, and the result is something we call an ecosystem.