I think specifying lift capacity at pivot pins makes it easier to compare apples to apples in loaders because it is independent of bucket type, weight, and size. What we are really looking for here is a relative metric to compare tractors that is still somewhat useful in real life. The fact is that none of us (the sane ones, anyhow) will check to see if we have 2205 pounds vs 2580 pounds in the bucket. When it comes to actual day-to-day use the load is either too heavy or it's not.