Quite interesting SO'P, reminds me somewhat of my Grandmothers method of baking Cake (whilst she inevitably also sang). Well of course she knew what was supposed to go in, and how it was supposed to come out, but being a baker by trade, she didn't weigh or measure. Instead she would just adapt what she had to hand to make sure the cake baked alright. Sometimes adding a few cherries at the end if the fruit was short, or milk if the mix was too thick. Sometimes she'd leave it in the (slow) oven for an extra half an hour, if the middle hadn't quite set, etc...