I don't like to make generalities, because every area is different.
True - but the trend of having FDs do EMS seems to be universal.
Then with the recognition of the importance of EMS in pre-hospital care, especially related to auto accidents, more and more fire departments began assuming a larger role in EMS, whether through first response or transport.
You know what happens when people assume...
Look at it this way: there are some cops who hate writing traffic tickets, they are others that live for it...the police department as a whole is still successful, though.
I understand the point you are making, but it unfortunately reminds of the other weird trend in FFing towards having FDs have an enforcement branch to write tickets for fire code violations. Don't get me started on THAT can of worms.
I'm lucky to work for a department that takes both firefighting and EMS equally serious, and work with members are able to (and want to) deliver both services exceptionally well.
The citizens in your area are lucky then - as long as the two agencies genuinely "play well together" in the FIELD (not just in the newspaper and at city hall) towards delivering good service. That does not happen everywhere.
I'm not looking at the world through rose colored glasses, and understand that are still departments in the US that don't embrace EMS strongly.
Its NOT just about how the FDs feel about it. Consider how EMS feel about it.
However, that being said, fire-based first response is still an important part of EMS today, for any number of reasons that one might decide.
Where it is needed and where it works, which is NOT everywhere.