Cup sizing is proportional to band size, so a 44F and a 34F do not have the same volume. I suspect that when you think of a 34F as "ridiculous," you are picturing absolute cup sizes. Also, the number refers to the band, not the overbust, so women with large cup sizes are not fitting "all of that mammary tissue into 36 inches of bust measurement". My best friend is a 34J, which produces about a 45 inch overbust measurement. It's not size inflation at all.