I don't want to sound dismissive, but a lot of what people say regarding the older games being more "magical" or whatever... yeah, a big chunk of that is nostalgia. Like, Animal Crossing releases are actually pretty rare. New Leaf came out, like, 10 years ago. The earlier ones, even longer ago than that. Most of us played those games when we were children. Of course everything was more magical and special back then.
My first AC game was Wild World, and it has a very special place in my heart. And yes, I remember the dialogue being a lot more varied back then, and it was, and that's an aspect where WW is still better than NH, but let's be real, the reason I remember the dialogue so fondly is because 1. as a child, I was much more inclined to spend hours doing nothing but talking to cartoon animals in a video game, and 2. there was very little to do in WW otherwise compared to NH.
Especially when people claim that there was more to do in WW or earlier games, like... No. Your child brain was just much better at filling out the empty space. There's no way you can say there was more content to WW or earlier games than NH, like, objectively. Heck, even NL is arguable; yeah, there's, like, the mini games, I guess, but NH has terraforming and more freedom for outdoors customization, so it balances out.
Heck, people complain about the villagers being "soulless" or acting like "robots". Have you actually gone back and compared the villagers from earlier games to the villagers in NH? Dialogue variety may be down compared to WW (and it has certainly gone up when compared to NL), but at least they actually do things when they're outside. They fish and try to catch bugs instead of pointlessly holding out fishing rods and nets that they never use. They sing and exercise. They play around and take pictures of interesting furniture. They water the flowers and get distracted looking at the falling leaves. They even have unique dialogue for when you give them something that they gifted you. How is that soulless when compared to the earlier games? How can you say that they act like robots when they are so full of life compared to the villagers from previous games, who would never react to the world changing around them?
Idk. I feel like a lot of people don't actually want NH to be better, as much as I agree that there is room for improvement with it. Frankly, I don't think they even want the AC game that they think they want. What they really want is to be children again. And Nintendo can't give you that.