It boils down to that there are not many good reasons not to. The vast majority of backends people write are really just relatively thin proxies to your database or something like that. They mostly wait on IO, which is perfect for node.
It's just a no-brainer when it's a good fit and you already have competent devs. Then there are advantages like being able to share types across your entire system without having to resort to code generation.
On top of all that, we have Effect which is easily the best and most robust way to write production grade typescript. It's nearly a language into its own and sort of should be, but we are fortunate that we can instead have and use such a useful tool in the most popular ecosystem in the world.
It's just a no-brainer when it's a good fit and you already have competent devs. Then there are advantages like being able to share types across your entire system without having to resort to code generation.
On top of all that, we have Effect which is easily the best and most robust way to write production grade typescript. It's nearly a language into its own and sort of should be, but we are fortunate that we can instead have and use such a useful tool in the most popular ecosystem in the world.