My wife and I are both melancholic, and therefore introverts. We don't thrive on external socialization. We get enough excitement from our home life, with all our kids. Maybe it will be harder if we ever end up with a real empty nest. But then again, perhaps "empty nest" is a Baby Boomer and later phenomenon -- something that happens more often when you have less than 5 children? When you have a really large family, wouldn't some of the kids stick around in the local area, have kids of their own, etc.?
Anyhow, we've both tried many times to make friends, and for periods of time we succeeded. But something always intervenes to take them away. Either the family moves to St. Mary's, KS or another SSPX "mecca", SSPX/Resistance politics causes separation, or fallen human nature (and/or the devil) inspires the father of the family to run off with money he owes us, so our 2 families never see each other again, through no actions, choice, or fault of their own.
And there are countless "would-be" friendships that never got a chance to start, because family A is in this location, while family B is in another far-away location. Or family A is in a sedevacantist milieu, while other other family is SSPX or Resistance. So there's no contact or socialization between the two, even though those two families would really hit it off in 99% of categories. The fathers and mothers in the 2 families might share some specific interests and hobbies, and the majority of the children might be into the same things: sports, music, art, history, literature, Lord of the Rings -- you get the idea.
I know several families that we would love to spend time with, but they live between 4 and 12 hours away. Trad Catholics are so spread out, especially the fervent, serious ones. The ones who have rejected the world -- which is important.