TS or JS? Put a verdict!

We're currently building everything (front-end/back-end) using JavaScript (JS/JSX), but from everything I've read and seen, almost all companies prefer TypeScript (for obvious reasons—you don't need to tell me why).

I had the same thought, and today I asked one of my colleagues, who's leaving soon, why we're not using TS/TSX. His response was one word: "CTO." Meaning, our CTO personally prefers JavaScript. He then added that he’s always used TypeScript in the past, but at our company, he had to use JavaScript due to the CTO’s preference.

I'm bringing this up because our backend team has faced a lot of issues and spent an enormous amount of time fixing bugs. I was always curious why they weren’t using TypeScript to make their lives easier—now I know why.

What are your thoughts? Is there any good reason to use plain JavaScript when building new products?