Because handles aren't unique right now and people might reasonably be more mad to have their official handle be automatically made to be myname#2394. Handles

Because handles aren't unique right now and people might reasonably be more mad to have their official handle be automatically made to be myname#2394. Handles are the display name right now. You have a unique global user id across discord that's static and the 4 digit code to make your display name unique that can change when you change your handle.