Will admit i am nitpicking but I feel like biologically is a poor choice of word here. "Historically, culturally, sociologically, traditionally, anthropologica

Will admit i am nitpicking but I feel like biologically is a poor choice of word here. "Historically, culturally, sociologically, traditionally, anthropologically," all work much better than biologically (which to me would suggest a validated mechanism of action). I am familiar with Dunbars number and to my knowledge there is no biological mechanism for sustaining friendships in there.