Programming

In my mind, it's arisen as a result of two things about the JS ecosystem:

A) JS doesn't have a standard BCL, like most languages. It has the DOM API, for interacting with the browser, but it has almost no functionality baked in that is just there for the sake of it. There's a few exceptions in more recent years, like Map and Set, but most menial tasks still involve rolling your own implementation, or pulling in a 3rd party one.

B) Almost everyone places delivery size as the most-important concern in web apps, so that actively encourages (or at least, it used to, less so now that tree shaking is a big thing) developers to package things up at the tiniest possible granularity, in order to prevent applications being built with a ton of code that isn't being used. Ironically, at scale, this effort had the exact opposite of the desired effect.