Yeah, I'm sure they wouldn't be helpful in every call. But the EMT user above talked about sometimes a caller giving the wrong location of a car accident. That's a clear case where a drone quickly on site could warn that crews need to be diverted elsewhere. But if it is just the occasional case where they'd be helpful, that makes them even less economically attractive.
As for fire services, in my city there is always a lead SUV vehicle (I think a captain or supervisor) who is a few blocks ahead of the actual heavy trucks. Presumably to get someone on site as quickly as possible; which made me believe that a drone could assist in that role. But I accept what you say, that there are too many limitations for it to help much, even if it can arrive quicker.
As for fire services, in my city there is always a lead SUV vehicle (I think a captain or supervisor) who is a few blocks ahead of the actual heavy trucks. Presumably to get someone on site as quickly as possible; which made me believe that a drone could assist in that role. But I accept what you say, that there are too many limitations for it to help much, even if it can arrive quicker.