Dont think it was as much to do with Hey Siri as it was due to raise to listen to voice message in the Messages app.reader mode is definitely still there i see it briefly displayed in the url bar many times a day, siri raise to speak wasnt "lost" it was intentionally replaced by "hey siri"
man I hate hearing this stuff... iOS 8 seems ok on my iPad but I just cleared a bunch of photos and videos off my iPhone 5 (16GB) to make room... just can't pull the trigger -- too scared
I guess you haven't used a build of KitKat in the last three months. It's astonishingly smooth, stable and polished now.
On 7 I was able to make it so I could have access to the Notification Center when my iPad was locked. I like this so little ones don't play with it and accidently ship it down seeing a conservation between me and my wife. My daughter is old enough to know to ask, but I have nephews who just like to take and play with stuff.