Create a local user in CDB$ROOT

Hello Experts,

As per the Oracle Documentation, its not possible to create a local-user in CDB$ROOT, only common-users can be created in CDB$ROOT

I'm a little curious on why would Oracle put that restriction, does anyone know a reason of having this restriction ?

ORA-65049: creation of local user or role is not allowed in CDB$ROOT

Cause: An attempt was made to create a local user or role in CDB$ROOT.

Action: If trying to create a common user or role, specify CONTAINER=ALL.

Is there any hidden parameters which can by-pass this restriction ?

Regards

Kaushik