Simplicity works if the block is a 4 patch or a 9 patch or a 16 patch, then it does not matter what size the seams are if they are all consistently the same size. If it is a mixed seam block, ie - some larger square blocks mixed with HST's or 4 patches such as the Good Fortune Quilt, then not having the expected finish size can create lots of problems sewing a block together. I aim for the finished size and mostly use a scant quarter, which for me is about 1 or 2 threads less than the standard quarter. But then, I do admit to not being able to follow the galloping horse rule either. "smile"