Here is the author's motivation:
"It felt wrong installing half of npm even for basic utilities, so I made JUST, a family of dependency-free modules" [1]
1: https://twitter.com/angustweets/status/754375515159441408
1: https://twitter.com/angustweets/status/754375515159441408
I'll never criticise anyone for releasing OSS but ultimately he just becomes the things that half of NPM relies on and the vicious cycle continues.