I guess I would straighten your pictures, too. I trim as I sew. I can't stand it when a thread gets sewn into a seam and I have to go back and trim it. I try to chain piece as much as I can. Then there aren't any threads to trim. Leaving them until the entire top is finished takes too much time to clip them all. I can see the long arm quilter charging to trim. It can take hours. I also trim some of the frayed edges as I go along. I guess my ocd is showing.
Sue