"Scant" becomes important on a complex block with lots of seams. If you oversize a seam by 1/32 of an inch (ya, I know, who can measure that?)and have 8 seams in the block, you will be off 1/4 inch on the block. Multiply that times 8 blocks across the quilt and now you are off an inch. If you then have a pieced border to put on, you won't get it to fit without mega stretching or tucks. So there, you scant say I didn't tell you!