Right, so this Knox and bootloader bollocks. As I see it, now that you can root a Knox firmware, there are 2 issues from flashing
1. Once you flash, there's no going back....
2. It voids warranty
So, for the first point, generally it's unusual to want to use old versions unless you find a gem. For the second, we all live with this possibility anyway when we start rooting or phones.
So really, is this not a lot of hot air and panic....or am I missing something.......again!