How do you switch off auto update? I haven't found the option in the settings app. Apparently my iPad still hasn't downloaded iOS 8, which I'm grateful for but I don't know why
I suppose it's more work for developers to keep their apps compatible with several OSes. But it's not as bad as it used to be, since you can still download the last version compatible with your OS. I once thought of using iMovie to edit a video I was working on while on the road, but I couldn't because I hadn't yet updated my iPad and iTunes refused to sell it to me. I bought another app instead and never bought iMovie even after I upgraded the iPad.