There were too many questions raised over the years for them to all be answered in the last few episodes. It wall all fiction anyway, they made it up as they went along. Why make up a bunch of other stuff that made no sense? When we invent Santa Claus, do we have to invent the answers to all the questions his existance would raise, or can we just accept him for what he is. The writers singled out the relationships the characters had with each other, and gave them closure. In doing so, they gave the audience closure on them as well. It was a stroke of brilliance. Who really cares about the other stuff, it was all invented to get us to watch the next episode anyway, just like the pulp fiction books a hundred years ago that always ended with a cliff hanger. Fun stuff, we have to accept it for what it is and move on.
>>The main argument against it was Christian saying to Jack, "It was all real.">>
And maybe it was, a reality we can't understand or comprehend because our circumstances are different than theirs. The things I did 30 years ago were all very real too, but that reality is completely gone and I can't find it anywhere. Where did it go? I can't even prove it happened. Reality is a slippery slope, it changes minute by minute.
"It's not enough to succeed, your friends must fail."