I wouldnt know since I have never used a fantasia, but wouldnt it also be interesting if certain NPCs recognized that you changed your race, or even clan.

I'm a lalafell, and I plan to change to Au'ra when Heavensward hits. Seeing as I have done everything as a lalafell in ARR, wouldnt it be awesome if certain NPCs from the ARR didnt recognize you because of your new race starting out? Yes, this might mean that this touch of immersion will cost money to some (due to CE bonus. Veteran Reward or Cash Shop), but it would be interesting. Like changing your identity (somewhat) to hide away from certain forces.

This wont make or break my decision to change, just food for thought.