Actually treatment is pretty much the same for BPD and Bipolar and tests have revealed very similar results from the same meds for both.

The duration and "energy" level is also still very much in dispute as well. Again most people are comparing BPD to the current two levels of bipolar which does not reflect a 3rd level that Borderline could play. A distinction should indeed be made and we pretty much disagree on if it should be mood or personality. May find more similarity with mood disorder then with personality disorder and that is the heart of the debate among professionals, why make it a personality disorder? Because of triggers? Duration of mood swings? Amount of energy with mood swings? Notice we are still talking about mood swings. Indeed the bottom line is this Borderline distinction is better fitted as a mood disorder not a personality disorder.

So again it comes down to why is it a personality disorder? And how does
1. duration of MOOD swings
2. level of MOOD swings
some how make it not a mood disorder but a personality disorder?