I try to alwaya make opposing seams but like many others, get a twisted seam now and then. I have been quilting for over 60 years and have never noticed any seams coming out where I clipped them. Usually I just iron them flat and go on. Sometimes we can get too concerned with things that really don't matter much. Keep in mind that I quilt for my family and not for juried shows and every quilt keeps someone warm. It's also my hobby and relaxation and I don't want it to get to be a chore so I try to enjoy every part of the construction.