But you already have cameras, screen, GPS, magnetometer, WiFi, IMU. To equip a RPi with only a subset of those would add considerably to the cost. You can even

But you already have cameras, screen, GPS, magnetometer, WiFi, IMU. To equip a RPi with only a subset of those would add considerably to the cost. You can even easily interface any Arduino for additional GPIOs via OTG and USB.