The PathPlanner Python library currently uses the @override decorator, which was only introduced in Python 3.12. WPILib and RobotPy officially support Python 3.9-3.13, and we support Python 3.10-3.13. This means that users who are using a RobotPy-supported Python version older than 3.12 (which our phoenix6 PyPi analytics shows is nearly half of all users) cannot use PathPlanner in RobotPy simulation.