[bwaynelewis]

The core libraries available in R are some of the most well-reviewed, carefully written, and correct codes available.

There are a huge amount of available libraries (thousands!) of variable quality thanks to the open nature of the project. But commercial software has problems too, especially with new and niche products. And when something goes wrong in those cases, you can't see why for yourself. Worse, other independent experts would not have the chance to either.