It's probably reasonable to guess that some classes will be inaccessible at first, having some sort of requirements to "unlock" them. In FFXI, the starting six jobs and unlocking the advanced jobs later was primarily an homage to the very first game, but adding quests to unlock most of the jobs gave them some cool background and lore. No one would complain if you could roll Dragoon from the start, but then your wyvern wouldn't have any backstory.
But really, this is Final Fantasy. In any FF where you get to pick your jobs, you always start out with a particular selection and earn more later on. In FFs where characters have predefined roles, you start off with a few and add more later. In ones where each character starts with a role but can ultimately be customized however you want, the customization options gradually unlock and become more advanced as you play. It's really just the franchise standard, so I'd expect to see it in some form, though likely not in a very limiting fashion.
I'd expect some people to argue that FFXIV should offer the full plate right at the beginning, because that's basically how every other MMO does it. I'd say that's because you don't get to change jobs at will without having to roll completely new characters in other MMOs. I think the same philosophy behind FFXI will apply to FFXIV: You are not one character with a single life's calling, you are a character with many jobs. To that end, an unlockable job/class system will serve as character development just as it did in FFXI, if that's how the leves fan out.
I LOVED the job-specific quests. I thought they did a great job of fleshing out a story for both your character, and for the job that you picked. Made you feel special, heh.
And actually, I liked that you had some real delayed gratification in the game. It sounds weird to say it, but I liked that I started out the game with some junky-looking armor and had to wait quite a while to play the job that I actually wanted to be, and then to wear armor that looked sweet. It made me all the more excited for those things, and gave me something to shoot for. It's what kept me motivated to progress. Edited, Dec 22nd 2009 2:16pm by Eske