It's not written from scratch... iOS 7. The bugs aren't specific to iPhone 5s either. They are causing random crashes on iPad 4 too. I'm not sure where did you

It's not written from scratch... iOS 7. The bugs aren't specific to iPhone 5s either. They are causing random crashes on iPad 4 too. I'm not sure where did you learn about kernels and drivers but they don't rewrite it every with OS upgrade. Stability is directly proportional to 'field time'. If you are regressing, you can't blame the flat 2D icons.