Let me add my voice to the growing number that thinks this is a bad idea (not that they will listen but it is worth a try).
I had envisioned the following:
In order to access the 3 new jobs you needed to have a character who already possessed at least 1 job stone and had at least gotten through the story to the point of being part of a Grand Company.
In Cortheas Central Highlands I would have placed the Machinist Trainer at Dragonhead, the Astrologian trainer at the Observatory, and the Dark Night Trainer either in the house on the hill in Skyfire or at worst Whitebrim.
This would have made perfect sense to me.
I wanted to do the Machinist on an alt and run the rest of the original story from 20(level you join the GCs) to the end, not have to do the entire original story then only get to see snippets of it on the new class.
I know they won't change it, and though I really love the game, I hope this decision blows up in their face.