[fixermark]

Incidentally, though the author says this can apply to any ecosystem, finding it applies to Ruby too often is what pushed me out of developing Rails apps. At least at the time I was using it heavily, the Rails space just wasn't stable enough to trust that I wouldn't have to learn an entirely new wheel to get my work done every time I went in to fix a relatively small problem.

"Can I implement the required minimial functionality myself? Own it" is advice one gives if one can't trust the libraries one depends upon to stay healthy, performant, and applicable to your use-case. Nobody'd recommend re-implementing readline or printf; if you have some heavy-lifting mathematics to do in Python, use numpy.