Well that is a non-answer on every front. Of course, if devs start pouring effort into Dart it will get an ecosystem; but why would I want to when Dart offers nothing over other languages?

And yes, we can submit feature requests, and the language authors may and may not add them. I'd rather go for a language that further aligns with the expectations of a modern language from the start rather than plead with the authors to turn it into something it's not.

> Dart is a language that's predictable (no WATs),

Ok, so it beats the raw JS with no dev tooling development experience. That's the bare minimum.

> performant

Plenty of performant languages to go around, including many more performant ones.

> has the best built-in tooling to facilitate quick iterative development

What does it bring over any other language with a semi-decent REPL?

> the best package manager

You'll have to expand on this, it's a very bold claim.

> and can be used to build web, mobile and desktop apps with high level of shared codebase between them.

So can any compile to JS language, Kotlin, C#, Clojure, among others, and since you place so little value on ecosystem I'll throw a special mention to Idris in too, which can compile to performant JS, the JVM (no bridge necessary on Android), C (usable on iOS) and pretty much whatever; and almost guaranteed blows any other language you can name out of the water when it comes to modern features and being pragmatic.