I know that anyone that has read any of my threads will call me a liar, but I am not a fan of FDR. I think that the updates should be built such that they take over properly and leave the device in a better state than it was before. That being said, I have been following a few different forums and always hit on the S4 Update threads and the vast majority of issues are corrected by an FDR. The iStuff has an advantage over Android in that the system is so closed. The Devs have to do things the way Apple wants it done and that makes for a much more stable system. It also provides you with with a very boring experience. Imagine your entire diet being composed of crackers that taste like the foods that you choose to eat, they all look the same they all feel the same, but they do taste like whatever they are supposed to taste like. You get the flavor, but he experience just isn't there. Android on the other hand is open and allows the devs to do what they will. UIs are open, data management is open and the list goes on... This is the experience that we Android users want.
UNFORTUNATELY, when that many degrees of freedom are given to the devs, programs become very diverse and some (even some of our favorites) can act up and/or cause issues. As an example, one of my favorite apps (Setting Profiles) used to not like another app I had on my phone and anytime an update came out for that app, I had to uninstall SP and reinstall. (That issue is fixed now.) That being said, when you do an FDR all of your apps have to be reinstalled so you get a fresh start. Some folks live by the FDR. They FDR before allowing an update and they rebuild their device after the update occurs.
Anyway ... although an FDR is not what anyone really desires to do, especially with this particular update, they seem to fix most of the issues that are created by the update. After the FDR, if issues still persist, then you have to begin looking at individual apps and that is a true PITA.
Sorry for the dissertation and good luck with the inevitable FDR,
BigRedGonzo