I learned never to use the steam to set(quilt) seams, I had problems with it changing the shape of block pieces.???? I set seems on all my quilt pieces then turn the seams to one side. open seams on a quilt I think(thinking isn't the same for everyone) weakens the seam . My quilts are made for long wear resulting in many washings..(kid quilts)
but each to their own way they like to do seams..