I don't mind "magic" powered tech, or even rudimentary tech like "steampunk". But I don't care to see futuristic tech especially in the areas of combat. The Ninja to me does not fit the vibe of the current state of FFXIV, but you could make a similar play style in a thief or red mage of sorts that relies more on implements than magic (grenades, throwing stars, smoke bombs, acid vials, potions): think Chemist from FF Tactics (throwing potions defensively, grenades offensively, or creating diversions) also could wield knives and guns O.o