Having worked at Apple adjacent to the likely responsible teams, the relevant details are: overworked engineering teams, insufficient QA investment, and most of all a yearly macOS major release schedule that persists primarily to benefit the egos of Apple's upper management.
Until you see a WWDC that doesn't announce a major release of macOS, expect more of the same.
To any involved Apple folks here, I feel your pain, and I'm sorry.
Until you see a WWDC that doesn't announce a major release of macOS, expect more of the same.
To any involved Apple folks here, I feel your pain, and I'm sorry.