DBMS vendor providing the client is nice. At least if you're using pg-native in Node, that's just a wrapper around the Postgres-owned libpq, but I've run into small breaking updates before that I don't feel would've happened if Postgres maintained both.
But that’s not Node’s fault surely? Shouldn’t Postgres be providing an NPM module given the popularity of Node?
No it's not Node's fault, this isn't their job. I don't blame Postgres either, cause maintaining libpq is fair enough, just would've been extra nice to have an official Node lib too.