It's beta software, Erik, with all that brings with it. If you use it, you're a beta tester. I've been one many times, and I don't do it any more. Too aggravating.
The distance/phase feature should work better than a measuring tape, because it measures actual responses, and many subs have latency due to their DSP. The DSP filters in the Anthem processor also may add different latencies to various speakers. So it's a good feature to have, once they get the software straightened out.
I agree, Anthem is not great on documentation. That particular feature works fine on the Anthem STR preamp using released software, but the user is on their own in figuring out how to make it work best.