For most casual acquaintances (that some people incorrectly label as friends), it's certainly true.
On the family's side: only parents, siblings, children, maybe some aunt or grandparent. Second distant cousin you saw 3 times in life?
You may feel this way, but it feels a lot different when you learn that one of your acquaintances has died.
I enjoyed a brief intellectual conversation with a professor at the end of a semester. When I returned the next academic year, I stopped by his office for a quick chat, but his name was no longer on the door. The department administrator told me "Oh, he's no longer with us."
My heart sunk. I didn't know him well, he may not have remembered my name, but I wanted to thank him, and now he was gone. Cut down in his prime? He was just an acquaintance to me, he was not my friend. But I still felt that shock and grief deeply.
I asked the administrator how he'd died, and she quickly clarified: he was still alive! He had just been a guest lecturer visiting for one semester from a Scandinavian university and had now returned home. This has taught me not to delay expressing my gratitude for the acquaintances in my life.
Granted, in retrospect, there's not really ever a sufficient amount of interaction you could have had, but if I see someone inside a cafe that I'm walking past, it's worth popping in and at least saying hi or waving from outside.
What's the problem about that?
I'd rather have my family and 1-2 close friends, and literally no one else, instead of 100 close friends that will vanish as soon as I am not able to bring anything to the table anymore, which will inevitably happen for everyone.
People on this thread seriously need to stop reacting so emotionally to things. Damn. Grow up people.
Instead, it actually is literally about each individual's immediate sphere, which, as you correctly point out, is where it matters. Having 5 true friends in a world with 100 people or in a world with 1 billion people doesn't change anything.
what I'm arguing is that it's not only the workspace where we all are disposable and replaceable. It happens in friends and family context, too.
What to do with this information... I'm not sure. But usually it's a good first step to see things clearly.