...and then your Javascript code will run on node.js, and the instance will be Dockerized for ease of deployment to a VPS. How many layers of abstractions are there?

It's turtles all the way down.

And they all live in a VM anyway.

and also nginx reverse proxy m8, with apache compiling instances to be deployed automatically to scale using latest gcc7 with 03 optimization for robustness against DDOS

Yes as some one who used to hack Fortran for a living I was having a hard time to find a use case for converting Fortran to js