No, sorry if I wasn't clear earlier. Big Comms business is gonna do what any business will do, oversell and under-deliver, and have weasel words hidden in the bid to get out of liability. The bid for the system near me is 268 pages. On page 72 is one line that says, "portable coverage inside buildings and vehicles is not a design requirement for this system and is, therefore, not guaranteed." Except a few of us think the fire department is expecting tactical fireground on the system. Oops. They aren't the cause of broken interop or not being able to talk to the neighbor and vice versa. They just chase the bottom dollar like everyone.
Divided ownership is also 100% natural and not the cause of any issue. A city, county, agency etc will own their system, and should have funding to support it.
Interop is an attitude, not a technology. Fix the attitude. Fire across the entire state has had it solved for a while. Law is so far up their own wazoo and digging deeper with these isolated islands of encryption, it's going to be real painful for a while. Do you know your neighbors on all sides of you? Do you know their names, have their phone numbers, and even have alternate numbers for maybe their kids or parents so you can call someone if they don't answer? Do you invite them over for a glass of wine once in a while? BBQ? If yes to all of that, you have the attitude needed for interop. If not, congrats, expand that mindset to an agency, sprinkle a little narcissism and, "our way is the right way, you bend to us, we don't bend to anyone" and the problem becomes clear as day.
edit: getting pretty far off the thread topic. But I’ll preach interop anywhere I can.