I think there's an important moral to the story - one device cannot be all things to everyone. And, if it tries to be, it becomes overly complex, overly expensive, and overly infrastructure dependent. That goes over the tipping point of practicality. It's an equation.
Seems some folks who don't grasp that concept (and want to auction "all of the frequencies" they believe public safety has) are pushing public safety toward LTE as its only mode of communication. Perhaps there should be a very critical failure analysis of JTRS before we go down the road a piece only to discover it would cost astronomically more and would be functionally less than discrete systems.
One more thing. Situational awareness. If you have 200 cameras bolted to 200 helmets, and they're all streaming video and biometrics (I think the movie Aliens did this in the 80s, but just with a platoon of space marines... maybe that's where some jack wagon got the idea it would be useful), and all that information is coming in, assuming it all works flawlessly, who in today's public sector is going to sift through the continuous streams to pick out what's relevant and what's not relevant? Are they going to be (as we used to say) fighting the fire from the switchboard? You know, overriding the discretion of, and perspective that only an on-scene incident commander has? Just sayin'.