Why did SE decide to make the three new classes not require base classes?

[Prototype909]

To be more accurate, the armoury system was dumbed down back in version 1.20-1.21. It just took the devs 2 years to fully understand their own doing and remove what had become useless.

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Now they better remove classes for every job, to keep things simple. Imagine describing the game system to a new player :
"There are 9 classes, and you get a job when they reach lvl 30, which is essentially the same as the class for most of them, and there is one class which gives two jobs, and you also have 3 jobs that start right at level 1 without class."
... when we could just have :
"There are 13 jobs."

The problem is with the way the plot/soul crystal stuff is explained I don't really see this happening - it'd be more work to rewrite those parts of the story to make sense than it would be to just leave it. They've already dug themselves into a hole and now they'll have to lay in it.