Nolio,
Not useful? Honestly? I used that feature on another application that I don't use now, for entirely different reasons, and it was very, very useful.
I certainly wouldn't expect it to assist me in finding "dead" devices or placing a heavy load on the system. The application can advise you of that through several other means. If you're paying any attention to the operation of your system you should be able to spot that for yourself soon enough. Battery powered (sleeping) devices are rare in the Z-wave market.
Finally, if one is expecting light weight apps like HG and others to save ones life one is a fool and deserves what happens.
JC