True, because you cannot avoid JavaScript. If you are building a new web startup, most likely you are going to write a LOT of React/frontend code. So it makes

True, because you cannot avoid JavaScript. If you are building a new web startup, most likely you are going to write a LOT of React/frontend code. So it makes absolute sense to write the backend in the same language...if you can. Typescript goes a long way in making this pleasant. Nothing is stopping you from writing the backend in different language...but as an organization, you lose the advantage of shared thinking in one stack.