There is nothing wrong with binding your quilts this way and at least you get yours done and can use them! It is sad when someone will criticize you (and your own mother no less,but some do) and all they do are the tops. Perhaps her tops will end up at Goodwill or sold on an estate sell for a few dollars. You see it all the time. Keep quilting the way you want to and be happy with your quilts. They are made to be enjoyed and loved.