There is a general consensus that Lost was making it up as they went along. I was speaking to that and not a writer's account of what happened.
Walt winning is for the audience. That's the stance that I am discussing from. Story wise, I get what you are saying.
You're talking about major events not changing. I'm talking about details that could change. You are a super fan that gathers information and that's how you debate. I stick purely to the material that I am shown and form my opinions from that. I don't like to have extra information cloud (or inform depending on your outlook) what I'm watching as it's going on. You state that they don't deviate from the writing but you don't have the scripts nor were you there to know everything down to the explicit details. You weren't on set with them etc.
Hypetrain existing =/= they wrote to cater to it, because the hype didn't exist when they wrote the ending, or any part of season 5.
Sure, when they wrote it. However that doesn't mean that during the meetings, shooting and editing, something couldn't have changed. There was a break in shooting the final 8 episodes. However, if that is indeed true, I'll take your word on that.
I agree with the sentiment of your last sentence. I am debating this as a fan of Lost. People have been using Breaking Bad to douse television shows that were people's and their own favorites for some time now. I would barely consider myself a fan of Breaking Bad because I wasn't there during the beginning. The final episode is safe and that just doesn't do it for me.