Personally, I'm waiting for the person pissed off enough that their childhood and teenage years were sucked dry by their potato sibling they start their own social media crusade against the Cult of the Potato. They'd have a lot of siblings-of-potatos to join them and spill the deets about their own neglect and their crazy parents assigning personalities and character traits to something that wasn't ever there. I predict the first people on that bandwagon would make a shitton of money too, it's down and dirty and pure unadulterated drama. People would love to hear about how a 10 year old had to deal with being woken up at 2 am once a month cause their sibling was in crisis, how they had to watch their mom break down 3 times a day while dad did nothing and buried themselves in work, and how their prom was ruined because their mom insisted the potato go too and they puked on the siblings prom dress. There's huge untapped potential.
The writer Anna Quindlen, at some point, published an op-ed about how she wasn't going to do any genetic screening during the pregnancy she was in at that time. Any ultrasounds, etc. would be if SHE had a problem, because she would have had the baby, no matter what. She got a LOT of negative feedback, most of it from siblings of people with disabilities, and not even necessarily those disabilities that could be detected before birth in the first place, or even those that happened after the child was born. Thankfully, she did have 3 healthy kids.
It was HER DECISION. And her husband's too, but mostly hers.
I knew a woman who died a couple years ago at the age of 97. In the late 1950s, she gave birth to premature identical twin girls; one baby died a few hours after birth, and the other lived to be about 60, with severe physical and mental disabilities. She and her husband cared for her at home until she was in middle age and her dad's health started to fail, and she was placed in a nursing home. One thing the daughter's obituary mentioned was that she always had season tickets at the symphony, because she loved classical music, meaning she was not a potato, if she could express this much. Mom's obituary said, about her decades of caregiving for her daughter and husband, "It wasn't a life I would have chosen, but I was still glad to do it." Chances are, if her twins had been born even 10 years later, they both would have lived normal lives.
I will admit that whenever I hear yet another story about a non-verbal autistic person who ran off and was found drowned in a pond, river, or swimming pool, that I wonder if the door and gates were accidentally/on purpose left open, so this would happen and nobody would get into trouble.