But I feel we got that in spades already. In my opinion, The Dark Knight was about Harvey. It was his story more than any other character's. And it was about his journey from putting all of his faith in systematized justice to him losing everything to random injustice.
I'm not sure about missing the point of Two Face. I'm really more interested in the point of this continuity's Two Face, and this Two Face just wouldn't have the motivation to be a career criminal, unless you fall back on the cliche of, "Well, his burns just made him go crazy," which isn't a very compelling motivation, not on par with what we were given in TDK.
I agree that I'm not entirely convinced that killing off villains is always the way to go. But, really, that's not what we've gotten either. Two Face and Ra's are the only major villains to be killed off so far. It's just a bit of a shame that one of the villains Nolan spared ended up dying anyway.
But to bring it back around, I got TAS for Christmas, and the one thing I found myself a bit disappointed by is the fact that so many villains are so... human. That's not what bothers me about it. That's awesome. But it means their villainy is tied to a very specific wrong committed against them, and, by the end of their origin story episodes, that's usually resolved... leaving them very little motivation to continue as villains. But then they keep showing up to do their shtick just because they're supposed to be villains, robbing them of their humanity and sympathetic nature that made them so compelling in their inaugural appearances, but which are almost impossible to maintain if you want to keep using them regularly. And that's what I appreciate about Harvey so much in this movie. He had his specific story arc. He fulfilled it. He got out of the way before he became tired. And his actions influence Batman's direction for the next film. I honestly can't see that being handled any better.