Part of the appeal of TypeScript is that you could fairly easily migrate a team to it from JavaScript if they're all fairly comfortable and competent with the current JS ecosystem. For most JS devs I've worked with, this wouldn't be true with a language like C# or Kotlin.
I'd argue that buying into a more comprehensive language would probably be worth it if everyone was into it, but in my own experience JS devs really, really like JS and have very little interest in learning something better suited to the problem they're solving. This is true outside of software too. People love familiar tools and methods, even if they aren't the best ones.
There's also the fact that your team's output will be best based on their enjoyment and engagement. Even if the tooling isn't perfect, they'll probably build better software if they're enjoying it. JS and TS are good enough in most cases to get teams where they need to be.
I'd argue that buying into a more comprehensive language would probably be worth it if everyone was into it, but in my own experience JS devs really, really like JS and have very little interest in learning something better suited to the problem they're solving. This is true outside of software too. People love familiar tools and methods, even if they aren't the best ones.
There's also the fact that your team's output will be best based on their enjoyment and engagement. Even if the tooling isn't perfect, they'll probably build better software if they're enjoying it. JS and TS are good enough in most cases to get teams where they need to be.