OpenResty is fine for just that... REST interfaces.

If you're making an entire web application with a lot of front-end code that is already written in Javascript it is an added cost to also support C and Lua.

A lot of important development time can be retained by not having to write the same functionality in multiple languages.

A module can be written in Javascript and used on both the client AND the server.

Don't conflate mainstream media fashion with the sort of pragmatic convergence that has been a big part of driving the adoption of node.

"Raw speed" over everything else is the Yngwie Malmsteen of programming language metrics.