Hi James,
I believe that's where the core distribution of Wildfly comes in --- to allow interested users to boot/extend wildfly as any type of server, not merely EE container.
I do find this useful. In my previous project, we build a software to distrbute fax to email. This software is running in different IDC across Australia, where faxes are terminated from telcom network, and instances of this software need to be managed and synchronized provision data from central node. If this piece of software has been equipped with Domain Management features like Wildfly provides, it would have make our lives much easier.
Regards,