The only real alternative to an embedded scripting language is lua, and too few prefer it over js. Lots of internals in gnome-shell is also written in js, allowing the scripting language to hook straight into the api and data structures without a plugin interface.
In a distant future everything is we assembly, with typed stable interfaces for plugins. But the might happen in gnome 8
Nix + dockerTools.
Doesn't even need docker, and if buitt with flakes I don't even have to checkout the repo.