One Size Fits All Plan "Time in Zone" Distribution Chart?

Hey TR Crew,

In the Beta Mac App, when I click on Training Plans, and then a specific plan type (e.g., Sweet Spot base), I now see a “time in zone” distribution chart. But this is 1 chart for Low / Mid / High volume. But we know that the “time in zone” varies between low, mid, and especially high volume. So why is there a single “time in zone” chart?