I'll start with the second part of the question first.
I think this technology can assist in collecting valuable evidence because like every one of us in the room, criminal suspects carry devices. I suspect every one of us in this room uses a device in a way that is more complex for law enforcement, with the apps we use and the way we use our devices. None of that is conducive to the old-fashioned wiretap activities that enabled us to simply send our order to a telco and have them send us the communications.
Given all of the devices and the fact that users have complete choice over what device they buy, what apps they use and how they use those apps, ODITs are essential because they help us manage all that complexity.