It really just depends on what you use the rclone drive for. If you are sending downloads to it that are only going to be there temporarily until they are moved to their respective folders, I would say a cache drive is almost necessary to have. If it is just for media and your downloads are local, you may not need it. I personally would keep it either way. Depending on what you are uploading, recent data is more likely to be accesses, which would be local and cut down on your rclone drive being queried, thus reducing the amount of API calls.