I don't disagree with your bullet points, Dave. Many of these items are taken for granted and even conventional systems need a system manager who determines minimum acceptable configuration. For example, going back in my "career," I defined minimum standards for access to a particular conventional repeater system because of a number of similar incidents that people created with personally-owned garbage. My scourge at the time were the 10 Watt Wilson radios that were about at the end of their life and were virtually unmaintained for about 15 years. I was getting epic-length stuck mics on a chronic basis. I REQUIRED that, in order to access the system, EVERY transceiver, portable, mobile, or control station, be programmed with a time-out timer set to no more than 60 seconds. If you can't get to the point and say what you need to in a minute or less, it needs to be said face-to-face, not over the radio (hams in particular HATED that [I'm a ham myself]). ALL radios had to be programmed with end-of-message unit ID. I could decode MDC1200, GESTAR, or Kenwood Fleetsync. Any of those were acceptable. The repeater was a Quantar, so P25 could also ride on the system. ONLY I could assign IDs, analog or P25. An unknown user would be challenged regardless of agency. Any duplicate ID would trigger an inquiry to the chief or department head.
And, the biggie: as the Wilsons came in for service (because the $13,000 repeater, $400 worth of cable, $1,200 duplexer, and $800 antenna were so crappy that there must be something wrong with the repeater because no one could hear it reliably on their 16 year-old Wilson), I would take it to the garage and put a sledge hammer to it, permanently pulling it from the fleet. A shovel, broom, and garbage can were next to the sledge hammer. Those were replaced with M1225 mobiles at the time, and although the M1225 didn't have an ID, all of the TOTs were enabled.
After a while the repeater system actually "worked." And, yes, I was not well-liked. Oh well. But the holistic system performed better, horseplay was reduced to virtually zero because of the IDs on the big fleet of radios that used the system (although onsey-twosey radios and volunteer radios were allowed to not have ID *IF* they had a TOT in them).
Moral of the story: communications is NOT a free-for-all. I think you are saying that, too. It has to be managed through active process and training. Then it can be the conduit it was intended to be.