I think Launchpad should start shipping mirror lists in -updates pocket (only; probably), so that we can update the mirror lists of installed systems as part of apt update and don't have to rebuild python-apt and upgrade everywhere.
I think Launchpad should start shipping mirror lists in -updates pocket (only; probably), so that we can update the mirror lists of installed systems as part of apt update and don't have to rebuild python-apt and upgrade everywhere.