If you change all the info the people in Rl will find out... Either from the person, or from that person on their friendlist anymore... They will ask like "Who are you?" and then "Where did Joe Go he was on my friends list a couple of days ago..." in a pm...
Either way you can get banned, the other way is safer...
That's why we change the username. once you change the name and delete friends, they wont be able to find you, which minimizes your chances of getting banned