Yeah, the problem is certainly real. I remember working with a much smaller python monorepo some years ago (probably 100x fewer python modules but the beginning

Yeah, the problem is certainly real. I remember working with a much smaller python monorepo some years ago (probably 100x fewer python modules but the beginnings of multiple client-specific variants that depended upon a swathe of core libraries) and we were already starting to see places it would be valuable to declare constraints banning certain types of imports that broke our desired module architecture and enforce those constraints during CI without needing humans to notice the violations during code review.