From what I see, dissociation is common in BPD and even more common in c-PTSD (which many doctors see as BPD). What kind of dissociative symptoms you have can vary and you can have more than one type.

The common notion is that you cannot have "a little" DID, but I've met loads of people who had what was DDNOS and they did indeed have DID type of issues, but some stuff were lacking for a full diagnosis. They exist and I don't care if people say DID is a total binary, these people exist and they are probably more than people with DID.

Saying these people don't exist is as hurtful as saying that people with DID don't exist.