Its very common that a simple task as creating new user or assigning roles to a user comes in as a bundle, where most commonly people ask for roles/user with privileges similar to another user.
If Oracle can provide a feature to copy a complete user blanket (privileges/roles).
Create user User_new as old_user;
Create user User_new as Old_user copy all privileges;
Where User_new can be a set of Users separated by a comma.
Although its not tough to create a script for it and get it done, but a permanent feature could be helpful.