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Its well past time to stop blaming the radios for interoperability failures. The human factor is the root cause, be it poor knowledge by the end user or poor planning by the admibistrators. A hypothetical 70,000.00 subscriber radio on a 70 trillion dollar international all modes encrytion cracking trunking system with 200 percent redundancy still can't fix stupid.
I live in a city where nearly every public safety radio has nearly every public safety talk group in it (special units have private encrypted talk groups. Homicide,SWAT, EOD etc) and still they struggle to talk from one district to the next. That isn't a failing of the radio....
Just saying.... Don't blame the radios so quickly.