not all the world is a web site or even internet connetted. not all the world has no safety concerns.
if you work in medical or aviation areas every release legally needs extensive - months - testing before you can release. If there are issuse found in that testing you start over. Not all tests can be automated.
i work in agraculture. the entire month of July there will be nobody in the world using a planter or any of the software on it. there is no point in a release then. the lack of users means we cannot use automated rollback if the change somehow fails for customers - we could but it would be months of changes rolled back whe Brasil starts planting season.
if you work in medical or aviation areas every release legally needs extensive - months - testing before you can release. If there are issuse found in that testing you start over. Not all tests can be automated.
i work in agraculture. the entire month of July there will be nobody in the world using a planter or any of the software on it. there is no point in a release then. the lack of users means we cannot use automated rollback if the change somehow fails for customers - we could but it would be months of changes rolled back whe Brasil starts planting season.