IMHO, I think that any art that uses fibers ie: threads, fabrics, etc should be considered Fiber Art and to me that includes art quilts and traditional quilts.
I appreciate the traditional quilts and the workmanship that goes into them. I love to see them and will ooh and ahh just as much as I do when I see what is deemed a "Quilt Art" I just prefer to work with different patterns than the traditional blocks. But I do love a log cabin quilt and a snowball quilt!