I can't say I care much about pre-arrival EMS details, but the fire side seemed to vocalize a lot of pre-arrival and on-scene info - has that changed since the retirement of the SmartZone system? Every time I pass through the county, somebody seems to be talking about something, lol.
While I wouldn't say it is fully because of the switchover, it has been building in recent years for less radio activity. Again, maybe it just me but after listening for 15+ years, it definitely is less chatty.
I think AVL's years ago really started the movement to less activity. With AVL's, there is a lot less of bidding of calls by field units (units still bid but is extremely less common). With less volunteer activity, you hear less Chief Officers responding, 2nd engines, Utility's, etc. requesting to be added.
In recent years, the county has really adopted each responding unit (1st Due Engine, 2nd Due Engine, etc.) knowing their responsibilities based on dispatch lineup which cuts down traffic.
As I discussed before, heavy usage of Computers/SME's...
It also seems to have been heavy turnover in the past couple years with Fire Alarm. A lot of dispatchers that I used to hear on the radio (which were very talkative and informative of response details) seem not to be assigned/working at Fire Alarm. Same could be said about field users as a lot of the chatty firefighters/officers have retired/left.
I think it is just a cumulative effect from multiple different avenues over the years which seems to have cut down radio traffic. The county is still one of the most chatty departments around but just seems "different" from years ago.