I can see why many people advocate for all-ALS systems. There certainly are some transports where the interventions that a paramedic can provide are likely to promote a positive outcome as compared to what an EMT can do - refractory asthma or status epilepticus are always the ones that come to my mind. So even if we concede that the research doesn't support the necessity of ALS on most calls, we know they are needed sometimes, and we can simplify the dispatch procedures and never have to worry about ALS being unavailable or a call being under-triaged if we just send ALS to every single call. I get it. On some level it just makes sense. I don't necessarily agree with it, and I think there are unintended consequences (such as skills dilution and lack of experience, which are possibly a bigger problem than we realize) that result from all-ALS systems, but I understand why the idea is popular.
Look, let's be honest here, and admit that neurophysiology is not something that most paramedics have a strong background in, either. Most paramedics can't really interpret the finding of these screening exams beyond recognizing an abnormality, in which case their intervention - putting the patient in the ambulance and driving them to the hospital - is the same exact one that an EMT would do.
These screening exams are actually designed, in fact, to be simple enough to be used in the field by folks who don’t have a lot of time and don’t have a lot of expertise in evaluating neuro patients. Anyone can follow a simple checklist.
We don’t necessarily need to summon the ALS gods from their perch high on the mountain of medical knowledge to come lay their all-knowing, all-healing hands on the afflicted in every case. Let’s not make it a bigger deal than it is.