This feels like an odd excuse moreso than a reason. Consider that most folks consider compiling software to go down to an assembly language. Which often has crazy semantics and intrinsics that many of us don't understand or know about.

I suspect what you mean is that they aren't just compiling down to JavaScript, but they are wanting to do so in a way that there is no foreign function interface (FFI) consideration for folks in either language. That is, largely to say, they don't want a Typescript runtime?