Cars are the breaking point for immersion when we have a Magitek empire who invaded us with a fleet of airships--one of which, crashed, remains in Mor Dhona to this day with Middy's corpse giving it a big ol' hug? Bipedal war machina are cool too. But a four wheeled vehicle? Dude, my immersion. Gunblades? Cool. Motorcycles? Dude, my immersion. FFXIV isn't high-fantasy where we only have magic, it's a fairly technologically advanced world.