Yes, that's the point of the metric. The observation that libyear is a dimension, libyears are additive. If you value some library years more, and some less, t

Yes, that's the point of the metric. The observation that libyear is a dimension, libyears are additive. If you value some library years more, and some less, then weight the sum. It's like saying there is no point of natural numbers, because when you count apples, some apples might be rotten.