Lets say for a moment that it was not an error or that a lore team find a way to fix like ( coff..coff..like the catheral on azys la... coff coff )

I see 2 posibilities here:

- What Kaiser said ( It just could be that Cid did not have any kind of training, I dont think he is the a guy that would be interested on using magicks )
- That garleans have a very deep limited use of aether, so limited that is consider worthless. Did Lucia used Cure I ? thats pure basic school learning of aether

About the aether syckness. Is that the reason why the legatus and centurios use masks on the first place? Kind of a radiation suit? ( to add, centurios have masks, are taller than hyrus and use swords, thats why ppl suspect they are pure blood too ). If its true that could be a nice excusse of why Nero is upsent, somewhere suffering of aether syckness.