a bit too excited. GP isn't wrong, Go pretty much has the same thing and I have never seen so much fanboyism for a single feature ever in my career.
I don't get it, but that might be because I am a manager.
See my example where a pure-rust postgres extension can start a background worker, listen on a port, and handle concurrent network requests, multiplexing them over a single backend calling a non-thread-safe internal postgres API.
That's possible because rust has no runtime to get in the way, it can use C structs natively and seamlessly, tokio offers the CurrentThread runtime (which doesn't spawn new threads), and a bunch of other details that need to be done right.
Try doing that in a pure-Go postgres extension.