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

[Prototype909]

I don't necessarily mind the fact that they're getting rid of classes as the story for those jobs will now just be continuous rather than split into 1/2 Class 1/2 Job as it is now. However I am worried about what this means for the existing classes who are still bound by the system compared to their new counterparts.

You can't cross-class job abilities as it stands, none of them. You can only cross class "Class" abilities, so how will this work with the new jobs? Will they just be self contained and be unable to take or give anything from the existing classes? Or will they re-work this system entirely?

[EdwinLi]

I don't necessarily mind the fact that they're getting rid of classes as the story for those jobs will now just be continuous rather than split into 1/2 Class 1/2 Job as it is now. However I am worried about what this means for the existing classes who are still bound by the system compared to their new counterparts.

You can't cross-class job abilities as it stands, none of them. You can only cross class "Class" abilities, so how will this work with the new jobs? Will they just be self contained and be unable to take or give anything from the existing classes? Or will they re-work this system entirely?

Well with Jobs only allowed to Cross-skill 2 classes I'm guessing Machinist, Dark Knight, and Astrologian will only be allowed to cross-skill 2 classes as well.

They may keep current classes as the only class that can cross-skill all classes.

It is also possible that Machinist, Dark Knight, and Astrologian will not have any skills that can be shared with the other classes.

This would mean that GLA, PGL, LNC, ARC, ROG, CNJ, THM, and ACN will be the only classes to provide cross-skills which make them valued because if players and cross-skills they will need to level these classes.

So to keep players into playing these classes, SE may make GLA, PGL, LNC, ARC, ROG, CNJ, THM, and ACN the only classes to provide cross-skills.

[Felis]

I don't necessarily mind the fact that they're getting rid of classes as the story for those jobs will now just be continuous rather than split into 1/2 Class 1/2 Job as it is now. However I am worried about what this means for the existing classes who are still bound by the system compared to their new counterparts.

SE don't get rid of the classes. They just don't add new classes to the game. The old classes (also the DoL and DoH classes) will remain in the game.