Correctness
Computational Geometry is notoriously difficult to get right. The convex hull algorithm is a prime example of this: From 1972 to 1989, 16 solutions were published in peer-reviewed journals and 7 of them turned out to be wrong.
So, why should you believe RGeometry is correct? To answer this we have to look at RGeometry's design and talk about how it leads to strong guarantees and predictable behaviour.