Since many of these bugs are also simultaneously raised by OEM's they are closed internally without feedback. And feedback to what bug, they are so many for the same! Also lot of them are feature enhancements and are really opinionated actually to work on. It could be better but it's not that bad. You won't believe the hoops you gotta jump to get anything done. Too many stakeholders in AOSP!(which has both pros and cons). I work on the AOSP for an OEM.