The problem is that, if paramedic resources are readily available via the 911 system, there's absolutely zero reason for an IFT BLS unit to be dispatched to a chest pain call. A unit has to be dispatched before they can mess up an assessment. So, it isn't just about visual vitals. I would love to hear the reason why IFT BLS is more appropriate than 911 ALS when the dispatch complaint is, for example, "BP 80/50." Yes, I've been on that call and there's no justification I can think of for a BLS unit to be dispatched on that, or any of the other resp emergencies at SNFs that BLS IFT units are routinely sent to in So. California.
What about, say, Orange County, where BLS units do not have access to online medical control?
I agree 100% on the 1st part, but SNF's often contact ambo dispatch 1st right? If they call us (AMR), one, in my division it'll be ALS most likely because we only have 2 BLS units, and our dispatch will usually send ALS for anything remotely questionable, but then I know SNF's that will call BLS ambulances for anything, and then the BLS dispatchers who will just send a unit anyway. The OC is a terrible example of an EMS system, where if you upgrade, you are usually just ridiculed by the FD medics for thinking it was an ALS call, and the mgmt who tells their units, just take the patient.