I think suggestibility wasn't exactly the right word for it. One of the primary characteristics of BPD is a poor sense of self. That is, they are often unsure o

I think suggestibility wasn't exactly the right word for it. One of the primary characteristics of BPD is a poor sense of self. That is, they are often unsure of what their long term goals are and what their values and opinions are. I think the DSM refers to it as a "pattern of instability of self-image." The thing you linked to phrases it as "A difficult relationship to ‘self’ such as difficulties with identity, self-esteem, feeling ‘different’ to others, or a sense that they are failing in the world." In the mild or moderate cases a person with unstable sense of self presents as someone who doesn't know what they want in life. In extreme cases, where the patient's view of themselves frequently changes, it would look a lot like DID. I agree it's not the typical presentation of BPD.