my fundamental of quilting instructor keeps reminding of the importance of accuracy with cutting, sewing and ironing but also reminds us of the galloping horse rule-if you wouldn't notice it from a galloping horse then it may not be worth fixing.
and besides that its a art not a science. science is supposed to be precise but since its an art its our means of expression. so what ever makes you happy is perfect. (so you can tell my work is far from perfect!)