I don't think users will get the bug improvements until at lest after Cook is gone. Cook just won't spend the money that is required to keep a software portfolio like Apple's up to date.
Cook never understood that when you create a new App it takes (at least in Apple's bureaucracy) at least 5 FTEs to keep it relevant, with all of the meetings and other waste. Plus a few more for improvements.
Now Apple's independent developers could do it for a lot less, but Apple has no respect for them. In fact, I think Cook sees them as stealing Apple's potential income.