There's a happy medium between the "everyone in the family shares absolutely everything" that less individualistic societies have and the "everyone in the family is alone" that more individualistic societies tend to have.

The US, in particular, is on the far end of that spectrum, because of the cultural emphasis on work and self-reliance. The happy medium, in my opinion, is trading off some work for some friends. In many cases within US culture, at least, you might be trading off an amount of time that yields a marginal reward at work but a much larger reward in friendship, simply because that's how diminishing returns tend to work.