This is making me really curious about why there's such a link between BPD, (or at least someone with strong-BPD characteristics who is otherwise undiagnosed), and a general helplessness/laziness/lack of responsibility (or whatever you want to call it) with respect to basic needs & everyday tasks.
Is it just that their emotionally stunted & underdeveloped brains make them like overgrown toddlers in everyday life as well... i.e. unable to perceive that things need to be done and do them? Like they can look at a sink full of dirty dishes, be the only adult in the home, and not understand that the burden is on them to clean them up before things get moldy and disgusting?
OR is it pure selfishness that drives them to have physical and household tasks done for them, just as they put the burden of their emotional needs on others?
I think it's both, a mix of the sense of overwhelm in everyday tasks, plus a strong sense of entitlement. But I'd add other factors too: not being able to handle shame, as well as using AVOIDANCE as a general coping tactic, which eventually leads to competency issues.
How would shame be a factor? I could imagine it in cooking. Your pwBPD might envisage cooking a meal, but she's so scared about making a mistake (e.g. burning it), that she quits before trying. She could be afraid of being "exposed" for her lack of competence. And so her coping tactic is to get someone else to cook for her. She just can't take obstacles and setbacks in stride, because she takes everything too hard and uber-personally.
Another possibility is that she's afraid of looking "stupid." My pwBPD, though she's in her late 20s, has the vocabulary of an early teen, which I think is mainly because she lost some years of education and life experience because of her BPD dysfunction. Thus I think she's confused by everyday menu terms, like filet, medallion or julienned vegetables, as well as by some slightly more sophisticated food items, such as arugula, fennel, asparagus, farro, capers, etc. She has trouble finding something "safe," and she's afraid of making a mistake, perhaps by mispronouncing a word, or ordering something she doesn't like. She lacks the confidence to ask the server about a menu item. She freezes up, especially if she can't find something familiar, like pizza, burgers or mac & cheese.
I can't help but recall a passage from Hillbilly Elegy, where JD Vance observed that his upbringing in poverty hadn't exposed him to restaurant dining as a kid, and he felt overwhelmed when he was first exposed to it as a young adult. He lamented that he had trouble picking out a white wine, because he didn't know the difference between Chardonnay and Sauvignon Blanc. I believed he picked Chardonnay because he thought it was easier to pronounce. I happen to think that's pretty normal, and I went through the exact same thing as a young adult. But the difference was, I knew I was smart enough--I just hadn't been exposed to these options before. I had enough sense to ask someone else to order the wine, because, "I don't know enough about wine to make a good choice," or something like that. If under duress, I would have asked the server for recommendations, or ordered the house wine or something. But I wouldn't take that as demeaning, or exceedingly embarrassing. I would take it in stride, learn from it and move forward. If someone ordered Chardonnay for the table, I delighted in discovering that I liked it! But pwBPD are so INSECURE and fearful of being "exposed" for incompetence, that they struggle with seemingly simple things like ordering from a menu. Their classic coping tactic is avoidance, or getting someone else to do it for them. And that might be why they seem so stuck in a childlike, dependent, seemingly incompetent state.
I'll wrap up with another thought: I believe that because of volatile emotions, pwBPD have a really hard time with executive functioning generally. Executive functioning involves having a vision, making a plan, prioritizing, focusing on completing tasks, filtering out distractions, tolerating distress, overcoming obstacles and trouble-shooting. I've observed that even "vision" is an issue for them. "Vision" involves knowing one's goals, likes and dislikes--such as the goal of having a nice home that is clean and orderly, or following a healthy daily routine. PwBPD have such an unstable sense of self, they have trouble even envisioning a life they want that's both realistic and stable (and not based on fantasy). I think "vision" also involves taking overall responsibility, as in, "I'm an adult, I'm responsible for myself, and I have a vision for leading a functional, healthy lifestyle." It includes "noticing" what needs to be done, and adjusting the gameplan accordingly. Like: We have a leak after that storm. The first step is to mop up the water, maybe set up a fan to dry it out, and determine if I need to repaint anything. Next, check if a window was left open or something. Then determine if there's a fix I can handle, like caulk a window and repaint, and make a plan to buy supplies over the next few days, while carving out some time to make repairs over the weekend. If I can't fix the problem, I need to call a professional and get it fixed before the next storm. But first I need to research some people to call, then get a couple of estimates, then I need to schedule the work.
But I think pwBPD don't have that "vision" of how to be a responsible adult and make things happen in their life. I think they are stuck in child mode, expecting others to make everything happen FOR them. With this mindset, their needs are immense, their expectations are unrealistic, and they feel constantly aggrieved.
Just my two cents.