[nogabebop23]

strong disagree, mostly because my life partner of 20+ years is someone who I worked with at my first job out of uni.

When you are young and in your first real job my experience is your best friends often are work friends. It's pretty natural to do things outside of work with the same people you really enjoy working with.

[kidfood]

I think the main advice given is that work friends can be real friends, but not all friends should be work friends. It's about "diversifying" who you spend time with because your relationship with your employer is not the same as with your friends.