Most of all, because it’s a story from which you get nothing.
After watching a movie, re-watching the most important scenes via a trailer is a good idea.
But prior to it, watching the scenes in a trailer only gives you a very approximate idea of what the movie is about.
The whole thing about the movie is not about some scenes but how the things get connected in a story.
And you can’t have a story well told in a minute or two.
