Do I need this upgrade? I read all the features and it sounds like it will just make the system larger with no real benefit to my older iPad which has very little RAM anyway. If I don't want it, how do I get rid of those non-stop prompts?
Like most updates, iOS 9.2 is more about stability, security, and reliability than it is about features. However you can get rid of at least some of the notifications by going to Settings > Notifications > App Store and turning off "Allow Notifications"
"All you've got to do is own up to your ignorance honestly, and you'll find people who are eager to fill your head with information" --Walt Disney