No, the churn rate is super-low. GC was introduced ten years ago and finally killed this year. QTKit was introduced sixteen years ago and also killed this year.

No, the churn rate is super-low. GC was introduced ten years ago and finally killed this year. QTKit was introduced sixteen years ago and also killed this year. WebView I believe still works! The deprecation cycle is a decade or more, and in every case there's a paved migration path (GC->ARC, QTKit->AV Foundation, WebView is trickier but for good technical reasons). This strategy and timeframe seems eminently responsible.