House of the Dragon teaser trailer (GoT prequel)

Right. I don't consider myself a pessimist but I just don't know how you go from thinking you're months away from finishing to not being able to give a date 6 years later. And the entire time he has been saying he's working on WoW too. It doesn't add up, but it is what it is. I'm not being a pessimist when I say I'm resigned to the very realistic likelihood that he will continue to not be honest about his progress, he will die before it's finished, and Sanderson will have both books out within 18 months when he does.

I think it's a major amount of not being able to figure out how to make it all work. He has admitted that to some extent. He still writes, but it's always something different in the same universe. He is also prone to massive rewrites. He could be honest saying he has 75% done, and then he decides to rewrite 4 chapters.

I don't defend him, or Rothfuss though. You can write an insanely small amount per day, and get a book done in a few years. I think both of them were motivated by financial security, and now that they will never be poor. They have both slowed down considerably.

P.S. For any Kingkiller fans there are rumors the 3rd book is going through the editing process. Still might be a year, or two from seeing it published if the rumors are true.