It may be generational too
Speaking as an American at the age when living parents are all advanced seniors - and many of those seniors live in homes and facilities, while it can be said without danger of over-generalizing, that to many in my age group, having your late-age senior living with you is seen as an inconvenience.
But I think at least when it comes to that WWII generation in the US, a very large number of them want to keep their independence as long as humanly possible. They don’t want to live with the family and they don’t want to cede authority over their “space” to any of their kids. So, it isn’t all neglect and self-interest. I know a lot of people my age who have parents who don’t want to move in, or they do it as a kind of last resort.
The ones who do, and take on a role in the family that I think is more like the model Alkasem describes, seem pretty happy though. I admire it.
When I was younger living in San Francisco which has a very high Asian population, it seems like all of my asian friends had an elderly relative, usually a grandparent, living in their house. Every time I went over to this one friend’s house in Chinatown, granny was always in the kitchen cutting up vegetables or something. I would see that and think, “that isn’t gonna happen at my house.” Neither generation wanted it.