[derefr]

Seems improbable to happen right now; there isn't really a large amount of newly-added complexity. Compare to QA in the beginning of the iCloud Document Sync (Ubiquity) era, where every app and many parts of both iOS and macOS had new features: Ubiquity itself broke down frequently, but the QA and maintenance engineering going into it didn't seem to make anything else in those releases less solid.