When publications go out of date, they are completely useless and all changes made to them can not be leveraged in any capacity. The changes in this feature allow publications users to move changes from an out of date publication to another publication. This allows users to salvage changes after an upgrade.
Release Notes
This feature prevents portal from being unusable when a change-tracked entity being modified in a publication is removed from production. If an entity is being modified in a publication, it cannot be removed from production. If a deleted entity in a publication is being modified in another publication, the publication with the deletion cannot be published.
We are constantly working on improving performance of Publications. We have implemented improvement for Timeline and Conflict checking icons.
Boost the performance of reverting changes , when the DB has huge amount of records. This way the usability of Publications further increases.