I think the ideal .emacs.d is just configuration and keybindings, with everything else factored out as packages. I'm not quite there yet.
miniblog.
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I've just realised that Community Fibre, my ISP, offers 5 Gb/s packages in some London addresses!
I'm struggling to imagine a use case for such a high residential bandwidth. When I switched to 1 Gb/s I needed to upgrade my wifi router to actually take advantage.
The most common selling point I hear for Nix is having a list of all the packages you need.
On a traditional Linux distro, I just install things and forget about them. A curated, commented list would certainly be handy when I have a new system.
I've been really enjoying paru as a pacman substitute on Arch Linux: https://github.com/Morganamilo/paru
It allows you to update both normal and AUR packages in one go, which is super convenient. It also shows you PKGBUILD files, so there's still a human audit step for AUR.