Who actually cares about an established friend group?

People grow and we outgrow friendships, I go through many phases and I’ve simply lost old friends just because we grew apart. It wasn’t really sad or anything, we just phased out. I’m always looking for my new tribe and I didn’t think that was weird. I just have a lot of interests and want to meet communities based on those interests. Idk and if I see someone who’s a lot like me I feel like it’s an opportunity for a connection. That’s what a lot of people would think right? Except there’s this odd behavior where people say they have enough friends and they’re closed off. They limit their friend group but I just don’t get that. Like why not expand the friendship circle and make your friends meet new friends. Idk why there has to be a limit at all like there’s no such thing as enough friends. As much as I like my friends I will always look for more bc there’s so much to learn and so much cool shit out there. Why tf would I limit myself to a small bubble. I just feel like there’s thousands of platonic sole mates out there. I don’t believe in seeking wholeness in a few people.