I am a little late to the Xcode 7 update, but I did it just this morning and am noticing this 'Update to recommended settings' warning displayed by Xcode. I have done some research and haven't found much other than users posting about this same warning with older releases of Xcode. This leads me to believe Apple will occasionally suggest changes in settings after big updates (I only have about 1.5 years Xcode experience).
In any case, it appears the warning just wants to change my bundle identifier. How cautious should I be before performing the changes?