When I took my 1st quilt to my long armer she was glad I had not put a border on the back because if your quilt is not square the border would not be even all the way around.
Do you think she was telling me that it was not square??? LOL She said that is one of the reasons they ask for the extra on the batting and fabric on the back - to square the quilt up. I doubt I will ever have a bigger quilt be square, so I guess no border on the back for me.