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

[Brianmj]

Is because they can't be bothered to make the base classes worth anything. In 11 people still had reasons to stay a WHM or aTHF even after openning up later jobs. Square didn't bother to make these classes worth anything post 30.

WHM and THF were jobs. We just didn't have to unlock them like advanced jobs. Classes in ff14 are equivalent to subjobs in ff11, in that they're a time sink.