I get that; while I do think "Chosen" is a far more hopeful ending - both for the survivors and for the story at large - s7 is the second weakest season of the show for me, and there are a lot of ways it could have been done better. And yes, I see that in "Not Fade Away" too. I guess my big problem with Buffy ending after s5 would be that... as I said somewhere else, I can picture Quentin Travers hearing of Buffy's death and muttering "Well, it certainly took her long enough. Next, please!" In the end, the events in Buffy wouldn't change the story at large, she'd be just another soldier drafted and sacrificed in a war she had no control over.

But yeah, as much as I love s6, there are times when I want to just hug the characters and tell them "You know, you could have just left her in the ground and moved on."