The dynamic nature of JavaScript is lost when using TypeScript.

Although TypeScript can be added incrementally, in practice I've only seen it totally replace JavaScript.

While I do believe more people prefer TypeScript over JavaScript, I think it's because those people never deep dived JavaScript or bothered to learn it enough to see how powerful it really is. There are also people that just prefer typed languages and will shun languages without static types.

This really is a religious war and boils down to one's opinion. I like JavaScript without typing.