My use case is that I have several legacy Zigbee devices from when I used SmartThings, and haven't found buyers for them.
Then there's Automatic, which I have on my Mini Cooper. With that, presence gets LOTS more reliable.
iOS Location, which has an IFTTT channel. Ditto.
It would be great if my Harmony Hub could confirm to Indigo that it has set an activity correctly, or that it has changed an activity without Indigo causing it.
So yeah, most of what I want to do is have IFTTT talk to Indigo. Plus, with two way comm, it's much easier to convince potential users that Indigo is for them!