I agree with @LordAndroid While we might not agree on the need for it, some devices (even different examples of the same model) just don't play as nice with major OS updates as others. Mine seems to be working as well as it did before the update, without doing a factory reset.
I agree with thinking that we shouldn't have to do a factory reset after a major OS update but sometimes it's needed.
I agree with thinking that we shouldn't have to do a factory reset after a major OS update but sometimes it's needed.