Since the launch of iOS 13, the problem has not been reduced, and there are a lot of bugs that need to be fixed after each update. Bloomberg reports that in the future iOS (iOS 14) will use the new internal testing program to prevent recurrence of serious problems with iOS 13 too many bugs.
At the moment, every internal Daily Beta will also put all the features in it at the same time, and then evaluate the overall stability. However, this approach is not conducive to finding the interaction between each functional change.
In the future, in iOS 14, the default will be to turn off all functions based on the system. The test is started on a item-by-item basis, so new iOS makes it easier to remove features that are not stable. At the same time, Apple can also more aggressively add new features to iOS 14, if there is a problem, it can be removed more easily, leaving for future updates.