Hacker News is all about hype and shiny new things, which Rails is not anymore. Node.js was the shiny new thing after Rails "went out of fashion" and just like Rails, Node.js is not the talk of the day anymore. It's having LTS releases, a committee and stuff, all the bells and whistles, but it's not fresh. As Node.js fell out of love, React was the new thing, along with all the different JS frameworks, but no one really cares anymore (it's "so last year").

We've now entered the ML/AI wave, which will last for a few months until people get bored and start getting excited for the new new thing (WebAssembly and the C/C++ toolchain? VR? Bitcoin?).