I would rather have seen C# Native AOT for the Typescript 7, alongside Blazor for the playground, but it is what is.
Now when .NET team complains about adoption I get to point out Typescript 7's contribution repo.
And yes I know the reasons, my nick is on the discussions, please also watch the BUILD session where they acknowledge having to rewrite the whole datastructures due to Go's weaker type system.
Yeah, its strange that Microsoft is not dogfooding its own stuff. Even as an "enterprise" Go developer myself, I would have preferred that Typescript was written in C# - it keeps language ecosystems diverse. And ensures that C# continues to improve.