Couple of thoughts: 20 years or more I was somewhat involved in a system development. Motorola was including their encryption algorithm included in there radios. They marketed as "getting rid of those scanner guys"
Second is, and someone with current knowledge correct me. if you get a federal grant for Radios, they have to be P25 capable and have AES encryption installed. There is not a requirement to use it.
Here is my take - I get the need, there are certainly situations as discussed above that would be appropriate for encryption. However, Using "transparency" and encryption in the same sentence is laughable. All the city has at the end of the day is trust, and when you try to "hide " communications people will ask what are you trying to hide? All jurisdictions tape record their radios but the trust issue is always going to be there.
I think the number of us that monitor communications is under estimated. and most of us listen for situational awareness and to know when to get the hell out of the way.
LACoFD put all their channels on Broadcastify with a delay. FDNY should do the same. At least the Borough channels and Citywide