This is also a result of the detachment of TC39 and the developer community. Just how many JS developers are participating TC39? I can recall multiple TC39 proposals that didn't even consult opinions from authors of notable open-source stakeholder libraries, and went straight into stage 3.
And btw, the TypeScript tooling scene is far from being able to get standardized. TypeScript is basically a Microsoft thing, and we don't see a single non-official TypeScript tool can do type-checking. And there's no plan to port the official tools to a faster language like Rust. And the tsc is not designed for doing tranditional compiler optimizations. The TypeScript team made it clear that the goal of tsc is to only produce idiomatic JavaScript.
And btw, the TypeScript tooling scene is far from being able to get standardized. TypeScript is basically a Microsoft thing, and we don't see a single non-official TypeScript tool can do type-checking. And there's no plan to port the official tools to a faster language like Rust. And the tsc is not designed for doing tranditional compiler optimizations. The TypeScript team made it clear that the goal of tsc is to only produce idiomatic JavaScript.