BPD is similar all PDs in the fact that, yes, they exist... but no, they don't exist how many think.
This is sort of becoming my catch phrase at this point but: Personality disorders are just collections of maladaptive traits in reaction to trauma.
The reason they have a genetic component, is because our brains may have a genetic predisposition to reacting certain ways to trauma. You may be predisposed to anger ("anger issues" "short fuse" etc), sadness ("highly sensitive person" "fragile"), avoidance, dissociation, fawn response, blah blah...
All of us have traits of PDs, because PDs are a natural consequence of human brains working the way they do. So when those traits get too intense, we are labeled. It's a double-edged sword, because it can help you recognize your own vices and heal... but it also can box you in.
ASPD is often diagnosed in people who are in prison. That is for multiple reasons. First of all, the diagnosticians that talk to convicts are biased. Second of all, these people are often in active crisis (prisons are, as you'd imagine, hard to live in), so many survival traits may be artificially elevated.
BPD is often diagnosed in psychiatric settings for the same reason. It's also important to note that BPD and HPD have a history of being falsely attributed to AFABs and women especially by certain psychs who use it as a stand-in for "hysteria." That does not disprove the existence of BPD though.
So, does BPD exist? Yes.
Does it exist in the same way as something like autism or ADHD? Not exactly.
It's just the fault of the psychiatric industry for not understanding (or caring about) human reactions to trauma enough. That's all.