I'm not sure how you got "I like Dart" from my two comments. I'm clearly saying that Dart & Flutter are based on very popular and well tested concepts/structures, therefore it is not very risky. Dart & Flutter by themselves may not be very widespread, but it's very familiar and easy to adopt to anyone who has done declarative UI web development in Javascript or Javascript-like language, which are widespread.

Rust, on the other hand, is treading new ground with the unusual core concept of a borrow checker.