Not sure if anyone has mentioned it yet (25 pages is too much for me to bother reading through completely) but...
Considering that the 2.55 storyline ended with you basically being hunted like a dog by the Brass Blades it actually makes a lot of sense that the new classes start at level 30. We've been whisked away to the "safety" of Ishgard which is surrounded by high level areas, Coerthas being the lowest leveled area (or so I'd assume) at 30. So assuming these jobs are being introduced by Ishgardians (lots of assuming here, I know) it makes a whole lot of sense in the storyline that they wouldn't be starting at level 1.
You can call it lazy of Square if you want, but I personally don't really mind missing out on the grind. I've already done it with almost every other class, and with a couple classes on an alt, so I think I've got my fill.