The info in your post is one reason I do my own quilting on my Juki TL98Qe or Babylock Jane. I am glad I have no room for a long arm. That way I won't ever be tempted to buy one.I quilt in rows and quilt around thick intersections. I have really pieced the backing and press those seams open. I have never had a problem quilting over them. I found your post very informative and makes me appreciate my quilting. I only quilt for myself, I am hard enough to please. I would think most others would br even more so. Have a great day.
P.S. I have always pre washed my fabrics.