I for one am thankful for Jest and Yarn. I recently switched over to Jest and I love most everything about it and the built in watch with caching reduces friction immensely (now if we can just allow custom preprocessors to return promises that would make life easier for integration of things like rollup). And yesterday I flipped over to using yarn and it definitely solves most of my pain points with npm.
So yeah, I'm definitely on the "keep reinventing" side of this debate.
So yeah, I'm definitely on the "keep reinventing" side of this debate.