I think you may be generalizing off the preview. They have a similar system to this in Green Ronin's Blue Rose, and you certainly don't wind up with identical characters in the same class. And that's even without feat and talents. The trick is to stop thinking of classes as "classes" and think of them as "talent collections." True 20 and Blue Rose do this with "paths". So, for example, using the Expert "class", you can build a ranger or a rogue. Two entirely separate versions of what we traditionally think of as "classes."
I like this, as it's a nice shift in game design -- what are we trying to do with this game mechanic, as opposed to a game mechanic servicing how we perceive they should work. It's also a bit more respectful of the player -- essentially "you know what you want to build, we're not going to make you spot-weld it into OUR definition of soldier." Definitely a different rules style, but I dig it.
Also, IMHO, looking at the SAGA book, in general, I'd say they owe the folks at Green Ronin at least a nice lunch.