People don’t have the energy to spend time with people because everyone is guarded now. Back in the day everyone usually knew the worst parts/weaknesses/fears of everyone else you spent time with. This made spending time with those people very comfortable.
No evidence but this is how it still is in South/East Asia.
Also anecdotally the best friends are the ones that are constantly making fun of each other. The modern recommendation of speaking in psychologist provided templates don’t lead to close connections, atleast in my experience.
