Attachment: 1. an extra part or extension that is or can be attached to something to perform a particular function. 2. affection, fondness, or sympathy for someone or something. 

Some attachments are good for you and some aren't. When you release an unnecessary attachment it turns into something else for someone else. For instance a fear attachment for you may very well turn into strength or confidence for someone else. Because you released the ankle weight it became strength for that other person. If we never release it how will we know.