I'm, admittedly, out of the loop when it comes to Node, but I do remember Sails looking promising when it was first announced. I recently suggested it to someone (who uses Node regularly) as a possible solution for a project we're working on and they'd never heard of it. So, between that reaction and the fact that I haven't heard of anyone else using it (or anything similar), I think you're right that a Railsy solution never took off.
Elixir is an interesting counterpoint, though. It seems like Phoenix was released and saw broad adoption very early on.
I'm wondering if this dichotomy is a result of where people are coming to these newer languages from: people writing Elixir probably aren't coming from the FE/JS world, but there's a very good chance people writing Node are. Prior to the somewhat recent proliferation of JS client app frameworks, using a smattering of libraries was a very common approach to solving problems. (It arguably still is, albeit at a different level of abstraction in React/Babel/Webpack land.)
Anyways, I'll be looking forward to reading the post you alluded to above, should it ever come together.
Do you mind extrapolating further, or will that be the topic of a future blog post?