I’ve been thinking about a couple of suggestions for flakes, and so wanted to discuss them.   Add a way to suggest substituters and public keys that improve cache hitrate for the given flake. Then add a Nix mechanism for somehow elevating permissions (via polkit?) if the user approves of those suggestions. This should improve the desktop experience of using flakes, if we ever come to a point where much software is packaged as separate flakes rather than in a centralized nixpkgs. Although I do ag...