If you take the time to look at each class, you can see different play styles, different uses. I for one like the idea of a "this or that" option. It means that you have to decide how how the story plays out. When i use arcanist do i want to attack or heal..do i want the be a reactive healer or a proactive healer...do i want to tank the boss or all the boss' minions. slow attack or fast attacks. Would you rather someone know a lot about a few jobs, or knows a little about them all?