You don't always have to jump to the hype train! Yes, you don't hear much about Dart here on HN, but the project is far from dead. The most important thing is that Dart works, it's stable and production ready and it's being used in production not only by Google but also by other companies. Dart is a very refreshing change for front-end development. No fatigue! Great tooling, nice language without surprises and option…
For me the project died when Google decided it wasn't worth it to support it any longer in Chrome and Angular team decided to use TypeScript instead. Regarding Flutter, I watched the conference where it was presented and none of the devices I own was able to launch the application. https://play.google.com/store/apps/details?id=io.flutter.gal... Unless Google does actually use the language to the point a few well know…
Is it still the case that none of your devices are able to launch Flutter Galler App? In an unfortunate coincidence the build that was published to Play Store right before the Dart Summit was flawed and declared that it is incompatible with most of the devices except for latest generation ones. This was rapidly fixed - but fixed build did not get into the Play Store on time.