I actually got the point, I was saying that it was still obvious which part was bigger, which is what a pie chart should be used for. Anything more complex than that, and it's being used incorrectly.
And the whole point of a pie chart is to use one thing -- the size of a slice -- to represent a single datum.
A 3d pie chart muddles both of those things for form-over-function reasons. How is this even contentious? Pie charts are notoriously bad anyway, especially if there's not a huge difference between the data points. This makes them notably worse.
So could you accurately estimate the two sizes? Research suggests you'd be better off with a bar chart than with a pie chart except in certain cases (25% vs 75%) and that isometric pie charts are worse than flat ones.