God. Think for a second before you talk...
Something being believable and not existing in real life are two different things.
FFXIV takes place in a realm with chocobos, monsters and such. Everything is done so in a way it seems believable within this world.
The sparks and magic effect, however, do not follow the same graphical style (and the sparks existing make no sense whatsoever). It completely breaks the atmosphere. It'd be like seeing a WoW orc hanging out with XIV's. Even putting a picture of a human being would look out of place, even though it doesn't get more realistic than that.
FFXI's spells all seemed to fit the visuals of the game. They had that polygon look to the them or whatever. I don't know how to describe it... but they didn't look like some computer generated graphic tossed on top of a breathing world.
You hit a monster a bunch of times, it sparkles and then dies? Get a grip.