I just recently got an additional diagnosis (Avoidant PD) and I felt so much relief that there was a name for what's been going on with me for so many years. I did blame and punish myself for my behaviors and mistakes, and now I feel like I can see a way out of the mess of my life and have motivation to find a way to live with myself.

So in my case at least, the label was very helpful, and of course everyone has their own experiences to judge.