https://thenextweb.com/apple/2019/11/23/apple-has-a-new-system-for-dealing-with-bugs-in-future-ios-releases/

Apple’s recently released iOS 13 saw a number of complaints from users about bugs both minor and infuriating. Ios 12 was the same. But for iOS 14, Apple has a plan to reduce, perhaps even eliminate bugs.

The main factor behind the bugginess of recent releases, sources familiar with the matter told Bloomberg, was the rate at which developers were committing changes — often daily, or at least weekly. These commits proved problematic, however, for other Apple developers. When one code change, or commit, went live (they go live by default in Apple’s coding environment), it often made test builds unusable for a period of time. This limited the amount of time testers could spend with the software and kept developers from fine-tuning feature releases as they were busy fixing bugs instead.