alt Hacker News> You write your frontend in JS/TS, your backend in the same language, your build tools understand it natively, and you share types between client and server.
that's an excuse imho. It's a post-facto justifying using js on the serverside because of familiarity.
I know because the exact same reason was given for GWT (google web toolkit), and that failed pretty horribly (despite it being quite good imho).
GWT was a huge success, and eventually became obsolete -- which is not the same as "failing horribly".
It took a long time for the web ecosystem to build up the capabilities that removed the need for GWT.
For a while, it was quite a good way to build and heavily optimize certain kinds of web client applications.