This might not be obvious in anyway if you’re not pretty deep in the Dart ecosystem but I’ve never seen anyone pay as much attention about building a good long term language as that team.

They put crazy amounts of thought and effort into how they evolve it.

Their entire strategy as far as I know was to intentionally aim for “boring and predictable” so that no matter how large or complicated your application got that you would never outgrow it.

Then they built a bunch of really nice tooling and DX on top of it.

It’s genuinely a pleasure to work with in my experience.