I was getting ready to connect my hue hub to my Harmony setup.
Then I realized:
The excellent Harmony Hub plugin reports state changes to Indigo. I just can't think of a situation where I would want to change lights with the Harmony remote that wouldn't already be handled by reacting to a status change from the HH plugin. And Indigo can react in ways much more flexible than can be managed with a couple of buttons on the remote!