You broke up her/his sentence which makes it seem as if level sync will make you level faster. Which is entirely not the case unless you mean by being able to find a party faster. Level Sync can be balanced well enough to allow friends to play together.
GW2 will also have such a system and as I stated maybe then will people finally see how good level sync could be if balanced.
Note: leveling up in XIV will also be different from XI.