If the seam is sewn to be wider then the first stitching then I don't take it out. Sometimes I will take a narrower seam to get a block to line up or not to lose a point. When I take a narrow seam I alway use fusible on the back of the seam allowance to be sure the seam does not pull apart. There are lots of fudge tips and tricks to use. Most I have picked up in classes over the years.