you mean Python and Ruby like languages are unmaintainable and therefore deprecated? I rarely have a problem with maintainability in JS because of types, but I do have problems with poor constructs, poor readability, dependency issues and so on. It's a typical illusion of TS proponents that code becomes magically maintainable.

JS developers moving to TS should at least do a few weeks of Assembly and C programming to first understand the origin of types. I've spoken too many front-end devs who don't have a clue what a type actually is and at the same time promote TS. It's a godsend we don't need them in scripting languages. Use tooling to catch issues, that's the future, TS is just a whim.

There's more to maintainability then just adding types. Maintainability is a process not a language.

Yes, and TypeScript is an incredibly powerful tool to make that process easier.

It's like using a bandage to prevent an injury. Yes it's good to have, but it doesn't prevent anyone from writing unmanageable code. Contrary it can make it even easier to write unmaintainable code.

You can say that about literally any technology. Nobody's claiming TypeScript will fix all your problems and discover all the secrets of the universe: it's just a useful tool that well outweighs the overhead it adds.