There's evidence that people like stuff just as much even if they know what's gonna happen, kind of like how placebos often work even if you tell the person.

People rewatch movies because they love them.

I'm about to watch the final episode of the One Piece adaptation, even though I know exactly what has happened.

The adaptation has deviated slightly from the manga, but that's to be expected of a series known for filler.

Yeah, I don't know. In the age of remakes, reboots and huge franchises can we really say that we watch shows for the story? Is any of the Marvel movies about the story? You always now how it will end. If you read the script of Guardians of the Galaxy would it really spoil the movie? I think those movies are actually more about 'being involved'. Same as Star Trek or Star Wars. It's about following, being a fan. Story is the weakest part of those movies. It's all about CGI, action sequences and 'fan stuff' like callbacks, references and so on. I think showing what's happening on the green screen wouldn't actually spoil anything and would be really interesting to the fans.

And regarding fans ideas Sonic comes to mind. They released the trailer, fans complained and it got fixed.

But I not saying that all the shows should be made like this. For some (most?) I wouldn't work. I'm just saying... wouldn't it be interesting to see the entire process for a show like this?