Hah, touche!

Dart really deflated after it was announced it wouldn't get native support in browsers (next to JS), and energy was instead diverted to WebAssembly. It might still get a revival some years down the road with Fucsia, but we're a long way away from that - plus it would still have an Android compatibility layer I'm sure.

Dart is still better lang than JS and AngualarDart offers much better dev experience compared to React and Angular + TS (I tried all of them). Big Google apps (Ads UI) are written in Dart. Try it out and make your own opinion https://webdev.dartlang.org/angular/

New life will come to Dart when fast Dart to JS compiler (so called DDC) will be released.