"Advanced Classes = Fundamentally Different Class Designs"

What do you think would require more effort, resources and staff...

Allowing a one time or multiple time AC Switch?

Or writing, creating, programming, voicing and implimenting brand new storylines and characters to seperate the AC's?

What do you think makes more sense from an immersive perspective?
"Hey, I'm a Guardian. -Forget that- Hey, now I'm a Sentinel!"
or
Character A gains companion X
Character B gains companion Y

More stories are planned already anyway.
More companions, with more voice acting and more stories are also already being planned anyway.
So would it be that weird to make good use of that knowledge and use it for some more interesting variations, increasing the game's replayability even further? I think not. It's only a logical addition.

the legacy system is encouraging you to roll the opposite faction. so pick the other AC when you play the opposite faction you can play all 8 AC's and play 8 different story's

problem solved

yes, immersion, that's what is the top agenda.

"I thought you were dead."

"Yeah, I'm not now."

I'm not talking about 1-50 when I say "separate" ACs, I'm talking about future content.

Immersion-like 'I'm a Sith pureblood trooper' or 'check out my Chiss Jedi'?

Which would be more fulfilling to the playerbase and create exponentially more gameplay?

They could further differentiate the classes without rewriting new storylines and adding more voice overs.

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Well, there already are Purebloods on the Republic side. Just saying..
As for Chiss Jedi?
http://starwars.wikia.com/wiki/Kung%27urama%27nuruodo T-Canon, which basically overrules C-Canon or your personal N-Canon.

So by that logic we should be able to play Wookiee Jedi too right? I mean there was one so there must be more!

I won't even ask how Chiss go from integrated enough to lead the Republic's most elite squad to being completely forgotten until some art critic shows up a few millenia later.

Hell, I imagine in an expansion we will have a ship crash land on Endor...