I do have a wide variety of acquaintances though. I wouldn't consider them expendable, but they could easily be replaced.
Then there's people that I have an instant connection with and I work at buiding a relationship with. I wouldn't consider these people easily replaceable because there's such an instant connection that I would like to turn it into a lifelong friendship.
As an ENFJ, it is fairly easy for me to make friends though. So I can see how the two that you know are able to do what you describe.