A mono repo is not needed. Some teams are able to push changes to all the packages of the team without it and without much effort (for example, the Debian Pytho

A mono repo is not needed. Some teams are able to push changes to all the packages of the team without it and without much effort (for example, the Debian Python Modules Team does that quite often). It's more a social problem: all packages should be maintained in the same way and people should be allowed to do global changes. This is true for some teams, not for some others.