I like the new OS, but I agree that it's a silly mistake on Apple's part to allow for the deletion of app data. I had to redownload all of my ForeFlight and WingX data. The OS is kinda buggy too in other ways. They really need to come out with a fix ASAP.
And probably not fair to blame Apple for a problem with a device that while very very handy, was probably not conceived as an "aviation device".
I have said it before and I will say it again, Android is the way to go and as soon as the "new" apple farce is revealed, maybe the apps will get made for both from now on. At least the Android can be programmed to NOT dump data, not that it does now. It figures our safety is of no concern to the company, there just aren't that many of us!