When creating charts that display stacked values, I find that sometimes the stacked values are small enough to result in the label from 2 different segments overlapping each other (see below example). It would be good if the chart either hid the lesser value automatically, or offset the different values to show both without conflict (bottom example).
Solution 1 - Displaced labels
Solution 2 - Hidden Label
Whilst this isn't really an issue when purely analysing data, when displayed in a map layout for exporting and sharing, it's not very cartographically pretty.