This leaves out or glosses over some very important areas, namely the use to which the can is being put. Soup cans are taller than ideal for minimum material use in part because it's easier to pour from them, while on the other hand a tall skinny tuna can would be hated. For a more extreme example, consider the guava paste can - an inch high and 6-7 inches across because of how the product inside is used. Think about trying to pour your soup out of that.