nanobind

As a newer project, it lacks the extensive third-party plugins and community tools available for pybind11, which can complicate integration in complex setups.

Key features like Stable ABI targeting require Python 3.12 or later, making it less suitable for projects locked into older Python versions.

While documentation is available, it may not cover as many edge cases or advanced scenarios as the more mature pybind11 documentation, potentially increasing debugging time.

Being actively developed, users might encounter breaking changes more frequently, as indicated by the detailed changelog, compared to stable alternatives.