I am with kaze on this, and similarily, a BG poster when I played FFXI and an elitist jerks reader when I played WoW... but I think that this is the kind of theorycraft and conjecture that are reflective of a game with limits that give true depth and 'replay-ability' that encourages both veterans and newcomers in this genre.
The base theory here does not make the game 'more restrictive than FFXI', it allows the game to be less restrictive than FFXI. Which was far less restrictive than WoW.
You have one character that can potentially change to any class anytime you chose.
The specializations of any advanced class may have to be changed in a city, but you could change from a specialized tank to a specialized healer to a specialized debuffer on the fly in the middle of a party. This is the most freedom that any MMO could possibly offer.
If you want to be a 'Spellarcher', either stick to the paper and pencil format, or try to find a dev tag for the battle system that would let you do the things shown in the opening movie... like a fireshot or freeze shot. (I think that might be what they are aiming for with the combat system revamp anyway... at least I hope it is... with battle regiments becoming more like combo skills... even a 'Meteo' cast by three different mages? FFXI or FFIV anyone?)