I agree with your overall sentiment, but I actually was thinking about the trailer I had seen for The Fall Guy as an example of a trailer done with a little more care, before even reading your post. I thought The Fall Guy trailer was cool in that it made you think you knew the whole story but it was a bit of an intentional misdirection. I would have bet $20 going into that movie that I knew the plot ... and lost. I will add the disclaimer that I am typically trying not to pay attention to trailers because so many of them do spoil the movie.