@RikkeOfTheLongEye
That's why when social workers assess people's needs they are supposed to focus on what the individual actually wants out of life and what their personal normal / ideal look like
I often end up at loggerheads with Social Work in my job because what I do is predicated on Service User interest, and not what my organisation perceives as their best interest. Social Work continually ignores this and invariably works towards what "the book" says is best.
I recognise a lot of the behaviours and traits in people you mention in your post by dint of the fact that I work with people who have mental health diagnoses. The thing is though, all of the things you describe, people with capacity have every right to choose to live that way if they so desire, which is why it rankles with me when social work, psychology, GP's etc invariably attempt to either change those behaviours or railroad the individual along a path that some outside agency or doctor has determined is "best" for them.
Whether the behaviours have arisen as coping mechanisms or otherwise, the fact remains that if someone wants to eat nothing but garbage, leave the house fewer than half-a-dozen times a year, or barely ever wash themselves, provided they are aware of the potential consequences, if they then decide to continue living like that then they are entirely within their rights to do so, and I will never accept people or organisations interfering with that because it's never coming from a place of user-interest, it's always what the service or organisation has determined is theoretically best and what the individual actually wants is usually completely ignored.
As an example, I've pulled my hair out at the number of times I've gone to a GP with someone who wants to wean themselves off a psychiatric medicine, they express this to a GP, and they are just met with a brick-wall "no" from the Dr. The Dr's job is supposed to be to help the patient, not obstruct them and work against their wishes. There are other avenues to consider beyond yes/no, but it's astonishing how often GP's and other services totally forget that ultimately the power rests with the individual provided they have capacity, and instead refuse to facilitate. It invariably comes back to GP's doing what suits the GP, Social Work doing what suits Social Work etc. The individual's preferences are usually ignored, and there is absolutely no justification for it. Even when there is a CTO in place you are still within your rights to ask for a medication review, or at least start exploring the possibility of a change/reduction in meds, but it's quite often met with a point-blank refusal to engage, and instead you hear "no, I'm not going to do that".
I work with one individual who is severely agoraphobic. To the best of my knowledge he has set foot outside of his flat no more than a handful of times in the past five years. He's perfectly capable of living independently, his home is clean and tidy enough, he eats well enough, he's content living the way he does. He has an ASD diagnosis and is socially awkward in the typical way often associated with Aspergers. He has no social life, no friends, no partner, isn't married, likely never will be, likely never will have children. He says he's completely uninterested in any of this, and he's also uninterested in engaging with outside services beyond mine because he says they invariably attempt to change his behaviours or cajole him to do so, and he simply has no interest in changing, so that interference is totally unwelcome. He ticks the boxes for a lot of the things which are being described as problematic in this thread, yet there he is, happily living in his own way, not doing anyone any harm, not interested in changing for anyone else's sake. He neither wants nor has any need of extra help beyond the things we assist him with, so I can't comprehend how he can possibly be considered a "problem" when he's content and the way he lives has no detrimental effect on anyone else. In fact, he's almost a model tenant because he has an almost ghostly presence in his block and he's a stickler from looking after his home, but he's inarguably "isolated" and has shunned family and most attempts to engage with him. What is he supposed to do? Make himself unbearably uncomfortable just so he conforms more to someone else's idea of "normal"?