Arch Linux's approach is similar. The only version of the OS that is blessed is the current version. Every package install should come with a full system update

Arch Linux's approach is similar. The only version of the OS that is blessed is the current version. Every package install should come with a full system update. Package downgrades aren't supported. In the case of an irreconcilable "X requires Z v1 but Y requires Z v2" they fork package Z.