For everyone asking Why Not C#? I think it's fair, given Anders who designed both C# and TypeScript was the one who announced this on X and is involved, to take them at face value on things such as "Idiomatic Go strongly resembles the existing coding patterns of the TypeScript codebase, which makes this porting effort much more tractable." Maybe after doing a bunch of prototypes, like they said they did, it was just the obvious choice at the level of the code itself, and I think if that's where they focused their decision rubric instead of on other factors like NIH or the current hot thing it's a refreshing way of making a decision.