When I grew up back in the 80s there was a sense of more stability, I think. People didn't move around as much. American suburbs were more of a monoculture(for better and, mostly, for worse, but it was what it was). That stability and comfort let people be more at ease and more open to things. I think now there's a generally higher level of anxiety and it spills over into the need to plan every social interaction.

Even as someone who grew up in more spontaneous times I find I need more scheduling and such these days.