Also, this is surprising because this was presented and led by Anders Hejlsberg, who is the creator of both C# and Typescript.
If anyone should have picked C# it would be him.
If anyone should have picked C# it would be him.
But I think it's also an indication that Typescript may be bigger and more important for Microsoft than C#/.NET is at this time. It's definitely much more used than C# is according to this non-representative survey of Stack Overflow (https://survey.stackoverflow.co/2024/technology).