> C#'s speed advantage over JS among many other things would make C# the main language

Nobody cares about this, JS is plenty fast for LLM needs. If maximum performance was necessary, you're better off using Go because of fast compiler and better performance.

> Nobody cares about this

And that was my point. The choice of using JS/TS for LLM stuff was made for us based on initial wave of SDK availabilities. Nothing to do with language merits.