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It only makes sense to me to switch to ARM if it dramatically lowers the cost AND dramatically improves battery life AND dramatically improves performance. All the other benefits of ARM don't outweigh the lost of being able to run native x86 OS at native speed (windows with bootcamp) or pretty darn close to it (various windows, Linux and even older Mac OS versions in VMs).
I didn't have an issue updating my iPad 2. However I was running 9.3beta on it previously.