No offense but TouchWiz is dead, the current ui is called the Samsung experience, we are running version 8.1 with the impending update to either 7.1.1 or 8.0 our devices will be updated to Samsung experience 8.5 with the same enhancements as the note 8. As for your launcher it can and will interrupt some aspects of the updates due to the fact you have changed the defacto UI and launcher. The nav bar is part of the original UI but the other enhancements like the improvements to the speed of the facial recognition will not be affected, nor will the knox update or any other non aesthetic feature. I live with the stock UI for this reason alone, and yes you can change the nav bar icons to suit your liking moving them in settings, thats for all the damn people complaining about the icons being backwards from their likening. Have a fantastic night...