I prefer to avoid choco
Why? I like the idea of establishing a package manager for windows. Some of chocos concepts have some issues though, but hey, thats in the nature of windows 
I just find it interesting that the version of Erlang is ahead of what’s used to compile Elixir.
Yeah, as I said already, for the official prebuilt archive, this is on purpose for maximum compatibility.
For the web-installer and the choco installer (which only wrap the prebuilt archive) the same is true.
Gentoo will always be built with the OTP available at the system of elixirs install time (as its a source distribution).
Arch will be built with the most current erlang that is available when the package is initially built.
I have no clue about why or how this is done on other distributions, but I think its mainly because no-one cares or even knows that this might be important for someone. So basically the easiest thing is done and the package simply wraps the prebuilt archive.
