Agreed, the groups of friends change over time. As do we. In my experience, a good new friend often takes the place of a departing good old friend.
Then, when you visit old friends you haven’t seen for years, it is good, but never the same. That time is past. The friendship is still there but the moment in life is not.
My Medium follow list keeps changing as some leave (sadly) and new ones show up to take their place.