The EEMKs the pilot referrs to are the enhanced med kits which carry a lot of the same drugs and equipment that our Paramedic units have. Shame they only teach the FAs how to use the AED and not start IVs and give epi and amio
Those kits are dangerous when used improperly, and even simple medical techniques (like performing injections properly) require training and practice.
For paramedics it pays off to train them, their practice will be nearly daily. Flight Attendants usually deal with healthy passengers and the emergency kit is rarely used. Is it worth to train a Flight Attendant to "nurse" level (and keep the qualifications actual), considering the expected use of that training? Now add in the probability of having a qualified passenger on the plane.