It does that, in a very limited manner. It can't handle complex setups by any means. A simple media setup, sure, but anything else than that it's very limited.

Why wouldn't a pro use it? Because it doesn't do what they need it to do. Harmony remotes are end user remotes...if you've hired a pro to do a system, chances are it can't be controlled by Harmony. If, on the other hand, you want Best Buy to set it up, a Harmony might work fine.