No you are not, your entire education and treatments are based around common acute illness with temporizing measures while transporting to definitive care.
Volunteers with skills like water purification, crop rotation, etc are of considerably more use in an austere environment.
Higher trained professionals like midwives are also a lot more useful.
High flow o2, backboarding, applying traction splints, manually ventilating a patient, etc are of absolutely no use in an austere environment that will not have evacuation as an option.
Most of the medical needs revolve around public health, chronic illness, and injury rehab. Without the benefit of definitive or curative intervention.
Telling somebody they need to go to the hospital is pointless. People with lifethreatening acute pathology are likely going to die from it.
It is a different world. While people with other skill sets may also be EMTs and bring benefit, the education and skills of an EMT alone are not valuable enough to justify the resources they use and require.