My kid attended a state flagship in another state (recently graduated) that is now about 50/50 on in state vs OOS students. This is an interesting question. He made connections with students both from in state and out of state. He had 3 roommates most of his college career. 1 was from in state, 2 were from out of state. His freshman roommate was from that city (random assignment), that wasn’t great actually. I am not sure that kid ever graduated, didn’t engage well with classes or campus that first year.
He looked at colleges all over. Finances were a huge reason for this choice and honestly he was a bit tentative starting. But it was a rigorous, well regarded school for his interests. That also was in a fun setting and city and didn’t feel hyper competitive. He much prefers a collaborative and friendly vibe. He had stats to apply anywhere, we visited many campuses (sometimes for my info and amusement lol) and had strong feelings about posturing and pretense in info sessions, student panels, sitting in classes, etc. I definitely think the locals affected the feel in a positive way. But not in a “you’re an outsider” way. It is a huge school and we were taken aback by how friendly and approachable and welcoming the faculty was. Over the past 5 years I’ve walked through campus many times alone, done many things, super friendly city/campus!
Also this is definitely called a party school and he is still not a partier. But still made great social connections, though early covid was a rough period of time. I also think many kids have a rough go making connections that first term in many types of schools. I think it is easy to feel like an ousider but many other students are feeling that way out of the gate. I also think it’s easy to assign it to something it to one thing like location/local culture. I remember struggling to adjust starting at my own state flagship that had some representation from my high school.