Exactly. First of all, apps are paused. They aren't left running. Second, if they are taking up too much RAM, they are shut down automatically when more RAM is needed. Pretty much as a result, closing or deleting apps won't ever really affect performance or battery life. I don't get why people can't wrap their heads around this. Apple has even said you don't need to close apps from the app switcher all the time, and they've never mentioned anything related to too many installed apps causing issues.Uninstalling notifications? What the heck are you talking about? "Having apps in the background" doesn't affect performance. iOS handles background tasks intelligently precisely so that running apps can't affect performance in any material way.
But you had the leather stitching and green felt! Times change. Now you have blur and transparency and it works a little different. No issues here either on iP6. Getting better and better.
I actually like the blur and transparency. I just hate that it stutters and lags and has weird quirks all the time. If they had all this eye candy running at 60FPS with little to no UI bugs, I would love it. However, it isn't that way. I'm not really saying I preferred the iOS 6 design, I just preferred the solid performance. You never got keyboards popping up in the wrong orientation, you never got awful frame rate issues, skipped animations, a weird pixellated and black and white spotlight search, the spotlight search bar appearing too high up/overlapping the status bar, etc etc etc. it worked smoothly, and as expected, every. Time. I miss that, not the green felt or general design language.