After spending 14 years an Artillery Officer and the last 11 as a HCA/HSO, I can tell you these considerations are not nuances or small matters. Working with MOs, Nurses, Pharm Os is not a simple task. Most medical units have a Log O that takes care of the Supply/Log side of the unit, they have little patience for the clinical leaders within the unit lines.
Therefore, it is more about learning when something is deemed critical and a surge (not extra electricity) is required in a medical facility to accommodate expected casualties resulting from a Major Medical Incident or a mass casualty, that lives depend on scarce equipment/resources and flexible priorities. When lives hang in the balance there isn't time to bring someone up to speed on the terminology beyond the content of a 9-liner.
In the manner that the Army has considered and rejected having a General Purpose Officer who is Infantry first and has sub-specialties, the idea of the Fd Amb as a company within Svc Bns has not been realized.
The HSO occupation also takes people from clinical fields (Pharm, Physio, Nurses) and places them in non-clinical admin and leadership roles. Who would mentor these people if there were no HCAs. The in and out logistics officers from the Log empire could eliminate the subtleties in the language that save lives, although one shovel or pick fits all, one surgical saw or blade is the difference between paralysis and sensation.
If the Log empire builders are looking to conquer, it should look elsewhere; our soldiers deserve a knowledgeable, compassionate health care admin or health services operations officer not a crusty, ignorant patient transport company commander.