I agree, for clothing it is not an issue, but for fabric it can be.
If you distort your fabric initially and then cut and sew, when the fabric is washed and dryed it will go back to it's original form and your quilt can distort.
I spray my fabric and let it dry, then iron to get the wrinkles out. You can use steam if the fabric is stiff, and it shouldn't distort the fabric, unless you get really aggressive with it.