This is me paraphrasing why the Flutter team think Dart is a good fit:
It's a familiar language for developers who have written JS, Java, C#, or C++. It has types to allow working on large codebases, and efficient AOT compilation. It has tooling for popular IDEs. Does subsecond hot-reload on iOS and Android (also more than just method bodies). It's performance, even on iOS dev mode is sufficient to do all of the layout and widget code. It's open source under liberal license which allows you to embed it your app.
Your claim: "There are plenty of programming languages that offer these applicabilities."
I don't think this is true. Even if you want to count Eiffel that's one, not plenty.
Nor could Eiffel have been used for Flutter since the GPL means you can't embed the VM in your app. Nor is it particular familiar for developers of existing mainstream languages.
Anyways, I agree that there's nothing "special snowflakey" about any of this technology, but no-one else, that I'm aware of, is shipping a language and toolchain that ticks all of these boxes at the moment. Hopefully someone will build this stuff for other popular stacks too.
(I am also aware of Eiffel. I remember hearing about it at uni back in the mid-90s when discussing CBD. I think it may be older than mid-90s too. I also don't think it would have been a very good choice for Flutter.)
Also what's with this whole "Dart struggling for survival" meme of yours. It comes off as kinda unhinged. Feel free to ignore the language. And people who like using it can happily ignore you.