As I understand it only the guix build command has an option to log output to a file. I would like to request that each guix command have the option at least (if not automatic like it is for Gentoo's Portage package manager) to log all output to a file. I believe this will help both users and developers deal with bugs and alike in the package manager. I realize people can already log all output using redirection like with:

COMMAND > output.log 2>&1