At the moment when a change is made to an approval group, in order for this to be correct across the board, it is then necessary to edit all historical assets (emails, landing pages, forms) so that the permissions match the new default asset permissions. This is a very time consuming task and it becomes more so the longer you use the product. It would be sensible for there to be a trigger button which allows the new change to be rolled out across all historical assets to bring them in line. This should both add on any increased permissions but also remove any decreased permissions.
For example, the User role previously allowed users to view and delete emails but now we would like them to be able to view and edit emails. Historical email assets will provide them with access to view and delete but this trigger button would overwrite that, removing their access to delete and granting them access to edit.