Some of the tools seems more like improving existing tools such as yarn (instead of npm) and jest over jasmine. However I still applaud Facebook for releasing t

Some of the tools seems more like improving existing tools such as yarn (instead of npm) and jest over jasmine. However I still applaud Facebook for releasing these tools since they often offer massive improvements over previous tools many regards. It might be more apparent if you're exposed to web development since the toolsets are changing constantly and quickly, some stability would be great in this space. This doesn't mean that we should disencourage creating new tools fundamentally changing the ways we work with them. You mention Git and I see it as on great such example, I remember with anguish some of the SVN trunks, working with their pseudo tags and the mess which you'd often be introduced to.