There may be a self-selective aspect to who comes here and sticks around, and that can impact the picture of BPD recovery we have.
It might be kind of like phone call surveys: the survey results aren't really applicable to all people, because the first, tacit, question of the survey is actually: are you the kind of person who answers a telephone survey. So the results only apply to the subgroup of people who like doing phone surveys. It's not "98% of all people love eating potatoes", it's actually "98% of people who love doing phone surveys also love eating potatoes".
If the pwBPD in your life is invested in healing, and is committed to meaningful, long-term therapy, then you probably won't be banging your head against the wall in frustration the same way as most people here (I think most members here have a pwBPD who is not healing and is not in treatment).
So, I don't think the existence of BPDfamily.com suggests that BPD is not well treatable, I think it's just pulling from a different set of nons, if that makes sense.
Maybe the way to say this
I thought that this disorder could be cured... when we read articles on the subject... we suggest that the disorder is well treatable... and when we read the stories on the forum it seems very difficult
could be:
"BPD is well treatable in persons with BPD who actively seek treatment".
I suspect that for many members here, their pwBPD isn't actively seeking/engaged in treatment... hence why we all need support.
Always an interesting point to bring up!