I've been following Dart since it's first release in 2012. I was able to be productive with right away back then. The JavaScript community freaked out because some Google exec in an email said Dart was a JavaScript killer. That did a lot of damage to it's acceptance. Dart was written with 2 things in mind afaik: 1) Replace Java based Google Web Kit used to write JavaScript (GMail circa mid 2000's) and 2) to serve as a backup language in Google lost the Java lawsuit with Oracle. Dart wasn't designed to be a shiny new thing like Swift, Rust or Kotlin, but more of a working language for day to day needs at Google. By those measures, Dart has succeeded admirably with Flutter taking off in popularity. Dart drew a lot of inspiration from C#, so I don't understand that complaint. C#, TypeScript and Dart are similar languages. Finally, Flutter/Dart should be compared to Blazor/C# and I think by that comparison, Flutter wins hands down.
I really like C# and .Net for getting the job done but Balzor runs Mono .Net in Wasm and the startup time is brutal for the public internet. 2 to 3 seconds. This leads me to believe Blazor is targeted at corporate intranets on high speed networks where you have a ready supply of C# programmers
I developed a fairly complex site using Blazor, starting back in the earliest releases. It was easy to deveolp for and having the depth of .Net (more and more features became available each release) was nice. I also found the build size to be an issue and wouldn't suggest using it for general purpose website. Microsoft really needs to focus on reducing the binary sizes.
ReveryUI seems like a nice project that works similarly to flutter, unfortunately they aren't sponsored by a giant company, but I would love to use reasonml/ocaml instead of dart (which is in no way a bad language, I just prefer to code in functional languages) to write apps.
