Is back protector needed?

Hey, I’ve bought all the gear - boots, jeans, gloves, helmet and jacket, however jacket only came with elbow and shoulder protectors. Few days ago I’ve finally got my driving license and started to think should I buy a back protector before getting a bike? Most of the jackets I saw comes with empty pocket for the back protector, so are there any reason why it is not mandatory? via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/bcbv92/is_back_protector_needed/?utm_source=ifttt