It's not an "aesthetic preference"; it's a functional preference for debugging and iteration speed as cited by the team.
Fair enough. Perhaps what I mean is that they don’t have a strong aesthetic opposition to JSDoc, which is presumably rare among TypeScript developers.
This is why I prefer to stick with JS and JSDoc.
I have been doing pro webdev since 1995 and since I got my initial experience without all of the contemporary tooling, my process has evolved to require very rapid iteration: the delay of a compile step can often break my concentration and prevent a flow state.