I don't really agree for a number of reasons:
1. NH is not dying nor due anytime soon. There's still an active community a year after its release and more players are starting the game this year. Nintendo has already said that they'll support the game with free updates for a couple of years, which tbh is more than they usually do with other games. I can see a lot of new players joining AC when a new Switch version comes out (which has been heavily rumored about). Likewise, the game is reviewed very favorably still: 90% on Metacritic (a Meta-critic must play), GOTY nominee, Bafta nominee.
2. I think it's fine that people don't like the game or don't like it as much as other games in the series. I'd say it's also okay that you're upset that a lot of content is missing from the game (I am too about certain content, not all), but I find it hyperbolic to say the game is lacking or barebones. NH, alone, has introduced: terraforming, new and expanded bridges/inclines, being able to move houses/buildings/trees, easier ways to get villagers/prevent villagers from leaving your island, customization, fencing, crafting, vegetables (pumpkins), paths, more immersive events/holidays (like Nature day, May Day, Museum Day and Wedding Season), camera mode, Harvey's cabin, HHD-style design in your homes, better character customization, vast upgrade in character clothing options, more QoL changes than every other game in the series, more design slots and items to design on, more fish, bugs and art, more villagers, 8 player multiplayer and 4 player (I think) co-op, and a long etc. While simultaneously bringing back features lost from previous games: GCN-camera angle, glowing hole, message in a bottle, Wisp, sending letters to players online, NPC dialogue (Blathers babbling and Sable and Mable talking about their life story, which was completely absent in NL), etc.
Also, and while controversial, I think the villager dialogue in the game is top notch (NL was a robotic mess filled with requests). And while GCN and WW is also excellent dialogue, it was just as repetitive as NH is (not to mention: GCN dialogue was filled with "tutorial" like dialogue even years progressing into your game and you got a lot of dialogue in the form of "buy/trade/give me that item you have").
3. I see a lot of people pointing out that multiplayer is lacking. I mean, every AC game (besides NL and GCN, for obvious reasons) was pretty much as it is now in NH. There were no mini games, it was all about visiting your friends islands and that was it.
I still get that there's still plenty of content missing from the game (especially when it comes to NPCs). I do believe a lot of it is coming in upcoming updates, but obviously I can't be sure. But what I'm sure about is NH is definitely not a barebones game by all means. I can't help but laugh thinking about how this forum would react if GCN AC or WW or CF released today as they are. Those games would be heavily criticized because of their abundant lack of content.