There is no reason to remove past versions from the archive, since the licence exception allows that. You can still pin or downgrade to that version; I don't th

There is no reason to remove past versions from the archive, since the licence exception allows that. You can still pin or downgrade to that version; I don't think apt-style upgrades should be considered destructive in that sense. The choice was to make upgraded systems secure by default, not to remove options.