I'd need to dig into the source code of this project more to be convinced, but I trust the implementation and algorithm choice in core R way more than any other

I'd need to dig into the source code of this project more to be convinced, but I trust the implementation and algorithm choice in core R way more than any other stats package except possibly SAS: among other reasons it has far more of the right eyeballs looking at the code. Picking numerically reliable implementations of most estimators is not trivial without the right training. Now, I don't know how much needed to be rewritten for this project, so that's just my general opinion.