I don't understand the comparison between the unpleasantness of a colonoscopy vs. collecting a stool sample. Anyone with a dog is collecting a stool sample eve

I don't understand the comparison between the unpleasantness of a colonoscopy vs. collecting a stool sample. Anyone with a dog is collecting a stool sample every day. It is not prohibitively high on the unpleasantness scale. Is the whole point of their work the incremental improvement of procuring blood vs. stool?