

That actually hasn’t been my experience of programmers’ behaviour. There are many developers who can’t be bothered to set up tools like IDEs, intellisense, debuggers, etc. which would definitely make them faster after the initial setup. I can easily believe it’s the same for AI.
That said, it does seem silly to require you to use it.
It’s barely transpiled. There are a couple of features that involve actual code generation - enums and namespaces (which are almost never used), but the vast majority of it is just stripping the type annotations so the performance will be 100% identical.
It’s like having “Python” and “Python with type hints” as separate languages and claiming there is a big speed difference between them.