4-5 years ago (when the popularity of node was skyrocketing but es6 was still relatively new) I remember some people arguing passionately that it was good to maximize code reuse, i.e. better to pull in a package with one utility than to write 5 lines of code in your own application. I think it was mainly a symptom of the gaping holes in javascript's standard library... thankfully that attitude seems to have mostly died off.