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

[Sadana]

I guess I'm okay with the whole 'no base class' thing from a gameplay aspect... It's not like knowing which classes to level and which cross class skills to pick is exactly intuitive.

Lore wise though...if they take away the THM story line, I would cry. ; ;
You can't really merge the THM and BLM story lines (or many of the classes/jobs stories, for that matter) and have it make any sense.