I've been sewing for years, and have had my serger for several years, too. It is only now that I've noticed on some blogs that some serge all the edges of their cut fabric pieces before even sewing them together. I've always followed the pattern instructions that tell you to sew a seam together, then finish the allowance. But this other method seems so much more efficient, and I'm really trying to improve my efficiency! Is one method better than another? Which do you prefer? Is there any reason I shouldnt' pre-serge my pieces? Thank yoU!