Crates are just a big convenience as far as I'm concerned. I love that I can send Cohen to her crate while I go walk a course. I don't even bother closing the door while I walk or when other dogs run since her stay in the crate is so solid. A few times Cohen has caught sight of her crate at the end of a line of obstacles and gone straight for it and crated herself, despite there being more to the course. I try to move the crate out of the way these days.