According to
this 9to5mac article, here is why we probably saw fewer leaks and less accurate predictions for iOS 15 than we have seen in past years.
Quote:
As analyzed by 9to5Mac, this may be related to an internal change in iOS 15 that hides features from engineers, which Apple has implemented to double down on secrecy.
Within the internal files of iOS 15 beta 1, each major feature introduced this year has a unique identifier (also known as a flag) that is associated with a “disclosure requirement.” In other words, this allows Apple to enable only certain new system features in internal builds so that an engineer or designer in one area doesn’t need to see everything that’s new in others.
To run an internal version of iOS, each employee must first install a special profile on the device — just as we do for downloading beta versions. However, each profile sent to employees determines which of these features will be enabled for each person working on new versions of iOS and possibly other Apple operating systems as well.
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