I'm not sure how linking to an article about the hype cycle can be considered evidence of Ember's maturity relative to its peers. Ember's 1.0 release was 2013

I'm not sure how linking to an article about the hype cycle can be considered evidence of Ember's maturity relative to its peers. Ember's 1.0 release was 2013 which is the same year React was announced. Yes Ember has earlier history as Sproutcore going back to 2011, but Facebook was using React internally since 2011 as well. I'd also argue that Ember 2.0 was pretty different from 1.0. Angular is older, going back to 2009, but as 2.0 is a total rewrite as well as departure from where they started out I'm willing to let that one go. (It is also a complete tire fire so let's just ignore it altogether). VueJS is arguably the "new kid". But really only just barely. The first release was Feb 2014. I'd hardly consider Vue immature at this point though. I really don't see how one can argue it has a tangible maturity advantage here. I also think that most of the newer generation of SPA frameworks have learned lessons both from the previous generations and their peers (with the exception of Angular perhaps).