If you don't choose to get the update, you don't need to jailbreak. It means that you don't get the advantage of Apple's own work, but that's part of the deal.

If you don't choose to get the update, you don't need to jailbreak. It means that you don't get the advantage of Apple's own work, but that's part of the deal. Either you can get Apple's updates or you can have absolute freedom of your system. I view it as similar to the way that each new version of OS X requires a new version of Shapeshifter for skinning, because Apple keeps changing their UI inner workings. Apple's not beholden to the third parties trying to change their system.