Their issue seems to be that it is not analog. The lightening port and bluetooth connection are two-way data connections, and the phone will be able to identify what is attached (rather than just outputing an analog signal). Here's the quotes that make that clear-
> But intentionally or not, by removing the analog port, Apple is giving itself more control than ever over what people can do with music or other audio content on an iPhone.
>With Bluetooth, the phone can distinguish between different types of devices and treat them differently. Apple can choose which manufacturers get to create Lightning-compatible audio devices.