FreeRadius 2.1.12, why is EAP AKA support in eap2 module

Hi, We are using FreeRadius ver 2.1.12, I had query regarding EAP-AKA support in eap2 module, its mentioned in FreeRadius website that "This module is experimental, and may not be ready for use in a production environment", Is it still in experimental state, can't it be used as EAP-SIM, is performance tested for EAP-AKA. I am waiting for response so that we supporting EAP-AKA in our product using FreeRadius, any specific reason for keeping it in eap2 module rather then mainline eap module. Waiting for positive and quick response, Thanks in advance.

Thanks Altaf