That's not criticism, but maybe the realization that there isn't much more knowledge to gain about friendships, if science knows exactly the same stuff as someone who is in a totally different department.
I think maybe it becomes interesting when combined with other relationships like colleagues. If you spend the prime time of your day with someone for 10 years, you also expect them to be dependable to some degree. However in a mostly formal relationship people can get quite surprised about how little they actually can count on their coworkers when sh*t hits the fan. And at the same time many people may spend more time, energy and money into their coworkers than into their dependable friends.