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

[KokoGigiyako]

Classes don't serve any purpose other than lore, and this is why I don't see the current 9 classes being removed from the game. Just think about the White Mage questline for exemple, the adventurer is THE ONLY non-padjal allowed to learn the ways of white magic and was only chosen for that becuase of his great skill as a conjurer.

Combatwise, there is no difference in leveling a "class" from 1 to 30 and then a "job" from 31 to 50 and leveling a "job" from 1 to 50 so most likelly they will simply keep the current classes and don't create any new ones in the future, having only pure jobs from now on.