Its industry standard. There is a baseline of information that is gathered and confirmed for every call regardless of call type. For most basic calls its not needed but there are many other circumstances where the basic contact information can be very valuable for police fire or EMS.
Callers' current location, contact phone number and/ or confirm the number you're calling from, callers name. Other information that may be obtained depending on dept SOP, center call volume, and seriousness of the call.... Callers home address, DOB, descriptions, plate #s etc.
At least in my area (northern NY) all 911 calls are recorded, and everything you say, provide etc is subject to NYS discovery should the case involve an arrest. For most basic calls it really doesn't matter it's just a way to make sure information is as accurate as possible.
Often times systems also cross reference information with GIS to confirm its correct. Own property in NYS? All your info is already part of the system.
In the case of a car vs deer all the information and data collected becomes part of the incident report and accident report... That information goes to insurance companies so they will pay out. It's all part of the system from calling 911 to the officer filing your bo-bo report.... and has been like this for decades.
Don't want to get involved don't call 911. Don't take it out on the dispatcher.
From CPR instructions, to birthing instructions the 911 system is not there to invade your privacy, just to simply get help to you, because you called asking for it. 911 didn't call you, unless you pocket dial 911 tying up resources while we confirm you don't actually need help.
The number of calls processed through 911 system in the state of NY alone is insane. I think people in general need to be a little more self-sufficient, and deal with shit on their own. Leave 911 for the real emergencies. Trust me when I say that a dozen other people already saw the garbage can in the center lane on that highway and called before you even knew it was there. You're not doing something unique or amazing by calling to tell 911 that the can is there, then being a douche bag because they follow their SOP.
Happy Saturday.