It's probably because of how much stuff I have on my island, and it's not that annoying or distracting in particular, but it is pretty funny to be walking down the beach and then my monster statue pops in.
Like when you'll be walking around, and an object on the edge of the screen "pops" in as it renders, instead of smoothly rendering in. A similar example I can think of is in Pokemon SWSH, how pokemon pop out of the groud in wild areas to spawn