I guess it's because of the process of changing it and to prevent people being absolute douche-bags and just simply changing their name to avoid any repercussions.
Have a permenant username separate to the display name.
i know ppl that have chsanged their names at least 6 times lol. Most of the techs dont give a shit as paid name change hasnt been implmented yet and its just easier to give u a free name change asap then drag it out and find out all the details as it wastes their time. Pretty much just call up and say u accidently put in the wrong name and they will just reset it
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