Update or luck?

I just started fresh after a couple of years. I have all 5 og biomes on my starting island. I have, in the past, found a small bit of mountain or swamp but I have a full giant mountain plus 2 small ones, a massive swamp, and a tiny bit of plains... that I can walk to.. from my first shack. Was just curious if this was partly due to an update to streamline the first portion of the game or if just some crazy rng.