[Analemma_]

I'm not sure how it is in Construct, but IME "well-optimized" JavaScript quickly becomes very difficult to read, debug, and update, because you're relying heavily on runtime implementation quirks and micro-optimizations that make a hash of code cleanliness. Even you can hit close to native performance, the native equivalent usually has much more idiomatic code. The tsc team needs to balance performance of the compiler against keeping the codebase maintainable, which is especially vital for such a core piece of web infrastructure as TypeScript.