Let's say you changed your Gamertag and wanted to adjust your display name to avoid invites being sent to a dead Gamertag when you LFG. You'd just type it in and click save, Right? Not exactly. You type it in and then you proceed to mash the "save" button on various devises until you realize that the button is just for show. Then you continue to lose opportunities in raiding or crucible groups because people are too lazy to look up what your new GT is.