but the focus is on them all together after death which makes the 6 seasons of story less relevant to the end.
It's interesting how viewers' can have different reactions. To me, the idea that they were all together after death, not because they were the good people, but because, as Christian said, the time they spent together on the island was the most important time in each of their lives, is the only thing that made the final season particularly relevant.
That would be why Sayid ended up with Shannon instead of Nadya -- who was no part of his island life. (I don't quite buy that the island would be more important to him than his history with Nadya, but maybe it's because she was associated with things he needed to let go of while Shannon was not.*) But then, why was Penny there with Desmond? That seems like it was just thrown in so that he could have a happy ending, just like the others.
Yet if you look at the Jacob story line, it's full of inconsistencies, too.
It seems like they were trying to decide between two completely different approaches to what the last season would be like, and they never quite made up their minds -- or wanted to eat their cake and have it, too -- and just threw everything together in a mish-mash at the end.
*Anyway, as soon as I knew that Sayid would never be with Nadya in the other time (flash-sideways, limbo, whatever), I was hoping Shannon would turn up and he would have a chance at happiness with her. So when she did turn up at the end, I wasn't inclined to quibble. They kicked Sayid around for 6 seasons, and anything that gives him a happy ending is OK with me.