The ground beef, giblets, vegetables and aromatics should all be fully cooked before stuffing the cavity of the turkey or other poultry. This is to prevent any illness. A stuffed turkey takes longer to cook than an unstuffed turkey. A stuffed turkey takes too much time to cook the internal stuffing to the temperature required for safe consumption. If you baked your turkey long enough to cook the stuffing to the proper safe temperature if would be dry.  No one likes dry turkey.