So like lots of things, it can be tricky to navigate as a single person. There is an assumption that people have inbuilt care around them (obviously not suggesting that children should automatically be carers). There are some procedures for example that require people to have someone with them for 24 hours after for example, and that the assumption is this is family. There arent appropriate services to keep people either in hospital or to provide adhoc care so people are denied procedures. Hospitals might not let people leave alone via taxi etc
The bit i was reading was about adhoc care not being as available, for example of the above where there are no carer agencies able to provide, but that also random visits like support to go to opticians, access far away appointments or even a life beyond medical care are very hard to get carers for. Hospitals rely on families etc to provide collatarol (but partners can do this), but often theres a level of a bit of a physicality involved eg. bringing in clothes, or money and toiletries (suprising amount of hospitals dont provide much food choice, limited drinks, or any toiletries) which is hard for older partners. Carehomes ask family to sort clothes, toiletries etc. A bit like in maternity wards where partners have to be present to bring babies to mums who have had a c-section, there is very high levels on relying that family will sort things
All health care relies a lot on advocacy and there are worries that they listen better to elequant children then partners who also look older, theres also a lot of chasing involved and admin. I know my neighbour had dementia and no family, and there was no way she would have made it to appointments as they would send her a letter and expect her to read it, remember, book a taxi and turn up!
Anecdotally Ive also read pieces that there feels like a greater divide when your friends have small children but that this improves when your friends are less in the trenches and have older teens etc, however that as friends become grandparents that this tends to dominate again.