Boost is basically why I hate C++ but yes your point is entirely correct.

I write rust every day for a niche application that SHOULD be on paper completely trivial given advertised crates. But I constantly run into amateur hour math/correctness mistakes because nobody is using this stuff in daily user-serving production except apparently us. Some of this stuff should just be inexcusable.

One time I filed a bug report the maintainers response I got was "well I'm not familiar with X" where X was precisely what the library is advertised to do.

And yet they are fine rewriting the API every couple months.

This is early stage. The next wave of open source from companies giving back their work is going to be excellent.