Split Machinist to Gunner and Engineer

[Rosenstrauch]

By contrast, all of the 'machines' it uses that aren't guns, actually come from characters that were never called 'Machinist's, Edgar and Prompto specifically.

This is actually incorrect. In the versions of Final Fantasy 6 that assign Job names to the various characters, Edgar's Job is in fact "Machinist". I imagine that's why the Machinist Job in this game uses so many of his tools specifically.