The decision to use Dart for this project seems to me like an attempt to find a lifeline for it. That's fair enough, but it could ultimately be a highly limiting factor and the reason it doesn't go anywhere. That would be a shame as cross-platform frameworks need to keep evolving to be more useable and performant.
React Native in my eyes has done a fantastic job of demonstrating highly performant JS driven applications that are accessible to tons of developers. An added bonus is the luxury of bundling in millions of existing NPM modules along with existing native modules. Facebook in my eyes is doing better at solving the code portability problem than Google, they are extremely focused, whereas Google, they want us to build things in a million different ways. Which direction do we go? Web components? Angular + Typescript? Dart + Flutter? Or maybe some new development far on the horizon that is the new way?
lmao what universe do you live in
If all the browsers supported a real programming language in their runtime, JS would die like Flash is doing.