I personally feel it's due to lack of an algorithm. I just hope this personal connection doesn't go away.
I doubt it's entirely due to the algorithms, I think it's more because of the people in the network. Nostr is still very niche, and if/when it becomes more popular, I'm sure you'll see the same patterns becoming more apparent here, to the point that algorithms may be required to "fix" that. But I'm also willing to admit the possibility of each social network having their own inherent "vibe," and nostr always remaining just as its pioneers intended... 🌲⛄