Every language comes with its own culture, and with its own stereotypes. Java's over-engineering and boredom, JavaScript's throwing shit on the wall and see what sticks, PHP's developers that do stackoverflow-driven development.

There are experts, average people, and bad people in every field. TypeScript brings sanity that is valuable for both experienced developers and less experienced developers.

The peace of mind that you get with types when doing refactoring is invaluable. I would never be able to go back and write vanilla JavaScript, because it's broken.

You can over-engineer and write crap code in any language.

Also a comment on anyone that says experienced devs get no benefit from types: you think you're good, but you're not. As good as you think you are, if you seriously deny the benefits of static typing, you're probably shit as a developer. If you understand static typing and it's benefits then you agree it's a good trade, if you don't understand it and still have a strong opinion against it, then you're just a lazy human.