party

The package heavily relies on R-specific idioms and data structures, which can be challenging for users coming from other programming backgrounds.

While the package is powerful, its documentation lacks comprehensive tutorials and practical examples, making it harder to understand how to use advanced features effectively.

Recursive partitioning can be computationally intensive. The party package may struggle with very large datasets, leading to long computation times and high memory usage.

The package does not natively support parallel execution of tree-based models, which can be a limitation when dealing with time-sensitive analyses or large datasets.