Longarm Quilter's have a fence, too. Computerized Quilting. Side 1). If you are not doing it freehand you aren't really being creative. Side 2) Creativity can be found in design selection and placement & isn't necessarily based on moving your arms around.
In all things I figure whatever it takes to get get the end results you are pleased with. I just learned about Wonder Clips and have started machine finishing some quilts. Never hold on too tight to your side of the fence. You might miss the view from the other side or at least the chance to visit with the neighbors.