Could a 1m30 trailer of your favorite book be made in a way that conveyed that it's well written? There's style and world building, small aspects of which can be conveyed in small formats, but there's drama composition and significant aspects of style and world that cannot be compressed into a format so small. I think almost all high capital "artistic" projects are conservative in their design, so as to be a safe investment, which basically means having a trailer that will sell. The question being asked, I think, is "if a given element of the production can't make it into the trailer, does it even have a return on investment?".