I think it's not uncommon for people to experience loneliness because of the insularity of certain conventional styles of family (especially nuclear family, but even of extended family). Various forms of chosen family are too often taboo or devalued against more exclusive "proper" forms of family. In spite of this article's allusion, nuclear family has such strong privilege over alternative, less biologically immediate forms of kinship and community, and it's so easy for it to wipe them out altogether.

From my point of view, intensely idealized, exclusive biological family models are inherently lonely, as too often they marginalize and preclude opportunities for us to explore deeply our broader human kinship with one another.

My experience has been that various organic communities have given me some of the most wonderful joy. My own nuclear family wouldn't have survived, time and time again, if it weren't for each of our larger chosen families, and for our acceptance of each others' chosen families.