I do! This trickling of content has been an approach Nintendo has taken with a lot of their games on Switch, especially Splatoon 2 (and Splatoon 1)—which was also developed by the same team that did New Horizons. ARMS, Kirby Star Allies, Mario Tennis Aces, Tetris 99, and, of course, Splatoon 2 have all had free content update support for quite a while after release. ARMS, Kirby Star Allies, and Mario Tennis Aces gained a TON of new characters after launch along with new modes and features. To a lesser extent, Super Smash Bros. Ultimate does this, as well, and third-party titles like Crash Team Racing had the majority of its content released after launch.
I could definitely be wrong, but I think the “barebones” nature of New Horizons was a deliberate tactic by the developers to keep players invested for longer periods of time as we receive periodic content updates. Sure, yearly events always have us coming back, but the promise of, say, bushes being added to the game with Leif in April and (hypothetically) the Roost or a post office being available to be built will provide refreshed gameplay for players who may have nothing left to do after “finishing” the main gameplay loop. The narrative of the story is kind of positioned to support this, with Tom Nook “recruiting” people from his past to help out with the island. With each update, I can also see batches of new or returning furniture being added, too.
I don’t think the game is “unfinished” by any means (which I’ve seen some people describe it as)—I just think Nintendo is adopting the same approach they’ve taken with a lot of their recent games. New Horizons as a whole will probably look remarkably different a year from now. Again, I may be wrong, but that’s just my perception based on recent Nintendo gaming trends!