[tikhonj]

Nix would help pull in the right versions of all the external non-Emacs packages you would need for a real IDE experience. Almost all the issues I've had with Emacs plugins have boiled down to poor interactions between Emacs and external software (wrong versions, wrong paths... etc), and Nix could fix basically all of it.

As a bonus, using Nix to manage Emacs dependencies would also give me full control over exactly which version of each package to pull in. This would create much more of a "distro" experience without needing any extra infrastructure.