They could have easily given insight to the Org, with or without Xion, but they didn't
And I blame that, again - on the Organization's structure, which eventually force their hands and got them to bring Xion in.
I'm not sure they didn't try because personally, I'm rather content with what the Organization had to offer. Luxord and Demyx got fleshed out personalities. We got Xaldin's story with Beast and some insight on how his mind worked. And they did a good job introducing Saix and Xigbar's stories which we were further exposed to in BBS.
So, really. Their pasts? Not part of Roxas's time in the Organization. Their duties? They actually took Roxas along for some of that. Plot relevance? Given to the ones who mattered.
So. Yeah. I'm kind of content with what they did all around. It's just that most of the Org don't have plot influence on Sora so they wouldn't on his Nobody and Replica either.
Even outside of the Org there are characters who could have used some insight, but, suddenly it's still about Xion.
My problem with this complaint is that it's not like Xion herself is free from the relative lack of insight. The seeming lack of flaws? Well, I don't buy it. We've seen quite a few times in the games that Xion can and does have a short fuse. And insecurity in my book is a flaw, but we never REALLY get to see her go through it on her own without reaching some sort of a conclusion.
What about the time she lost the ability to use a Keyblade? How did she manage with the Organization during Roxas's coma? What happened during that month she "eloped" with Riku? What suddenly got her to yes meet with Roxas despite running away from him the previous day?
It's during those times that get one saying "ok, so it's so much Xion in the game, might as well have this be a Xion game" and accept it that no, they give you Roxas in an emblem mission. Roxas searching through empty worlds. Roxas SITTING ALONE ON TOP OF THE CLOCK TOWER SIGHING IN A MELANCHOLIC MANNER.
So really. Their screen-time priorities are messed all around, even when it regards Xion.
It's just that coupled with how it doesn't seem like they had that much "plot" substance to the rest of the Org, it's felt a lot more with Xion who is, for better or worse, the plot they gave the game, like Namine to CoM.
Only we never got the Reverse-Rebirth scenario to show us some of what we both agree is lacking here.