Yeah pretty sure you can go back as far as you want in human history and people will tend to be friends with the people they work with. Gathering partners, building partners, scouting partners, etc. Befriending others to complete mutually beneficial tasks is a big part of the special sauce that defines our species. This idea that we shouldn't befriend those we work with is absolutely wild to me. Like, you don't need to be best friends, but you should get along and enjoy each other's company.