I never thought of my island was one of those islands, but I got a lot of compliments on it. Well, the previous design of island, anyway. It is the currently under construction and barely navigable let along inspiring haha. To that, all I have to say is that I had a lot of free time last year.
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I don't typically TT since I do actually like the whole seeing your island change over a long period of time aspect of the game, but I do trade a lot. I had my Sanrio cards from New Leaf and was able to get a lot of easy trades that way. I also got really lucky with DIY recipes when the game started and was able to offer crafting services for items. Pinterest's creepy little algorithm also decided to show me Animal Crossing inspo, so that was nice of it...
sorta.
The trading aspect was definitely also there in New Leaf. TBT had a whole section of the forum for it when I joined back in 2013, plus there were other sites and quite a few subreddits, too. There were even wishlist compiling sites for New Leaf. If New Leaf was as incredibly popular as New Horizons, we would have got sites like Nookazon, but Discord was only just starting to take off when New Leaf was towards the end of its peak.
As an aside, I think most people's islands are better than they think. A lot of times, it's not that someone's island is so much better than yours. It's that their island is so much different than yours. It's new. You
don't see it every day and have the layout memorized by heart. Of course it's all going to be interesting.