The question to me would be really something that has to be answered on several levels.
I have married into a family where there are two cases of people with these kinds of life challenges. Both of these females have these kinds of issues on a serious level, and the problems they have are not in my opinion well managed. In the two individuals we have schizophrenia, borderline personality disorder, depression, bi-polar, and histrionic personality disorder.
These are people who are on medication for their conditions. However, neither one of these people are well managed. Personally, knowing these people well, I would feel and have felt sorry for anyone involved with either one on a romantic level. Both are females, the medications have caused extreme obesity in one and the other one is trying to "catch up". Both see mental health professionals regularly. Very recently, one of these two at age 25 snared a male much younger than herself and almost had him talked into marriage. He was smart enough to "bail" before the "I-DO" and this is a fact.
I want both of these people to have great lives, but, they have both left total destruction behind them as they have both gone through relationship after relationship. One has had one disastrous marriage and numerous failed engagements.
People being treated for this have side effects from the drugs they take to remain even partially "functional". Weight gain, mood swings, memory loss, (including did they or did they not take their birth control pills) and a variety of other things. In these two women there have been abortions and all the rest when they "forgot".
We have also seen in one of the two a real problem with personal vaginal hygiene and several bouts with easily controllable things which could end up NGU (non-gonococcal urethritis) in any male partner with whom they contacted.
My biological Father after divorcing my Mom many decades ago married a woman who had these kinds of problems. As a result, he entered an eleven year visit to hell. Hospitalization for her, delusional behavior, and when he finally cut the cord to her after 11 years, he had to provide medical insurance to her for the rest of her life because the Judge thought it was "only fair" because of her "problems".
Being kind and politically correct is nice, but in real life terms it has no bearing on practicality and the potential for destruction of the lives of those around those who are for lack of a better term unfortunate to have these kinds of problems is very high.
I may catch a little flack here for this posting, but, I have had too much personal experience at dealing with the "functionally mentally disabled" for decades.
Personally, it is a choice that each individual must make for themselves.
This is a medical condition that the individual cannot help. They do not in any manner deserve to be mistreated, but in exchange neither does the individual dating or attempting to have a relationship with them. I have seen incredible heartache out of this one personally and as a result my catch phrase would be "Danger Will Robinson!"