But it would affect the absolute gap - everyone is proportionally richer, so the absolute gap is proportionally larger. My point is that knowing only the fact

But it would affect the absolute gap - everyone is proportionally richer, so the absolute gap is proportionally larger. My point is that knowing only the fact that "absolute inequality has increased" doesn't tell you anything about whether that's good or bad for the world. I agree that absolutes matter to the individual - but I personally think percentages are a better way of understanding and interpreting growth over time for most populations, because growth has historically been very consistently exponential.