For me, easier biomes are useful launching points for exploring more dangerous biomes. I'm always glad to see them; it means safer places to beach the boat, safer places to build bases. Black forest can be especially convenient for small bases due to the stone towers. If something should happen, better to respawn in meadows or blackforest instead of on top of a mountain. So I always like to explore them.

If you decide the map needs some expansion to the west say, and would like to establish a west-side base as a launching point for that exploration, what would you look for? I would look for an easy biome to the west, adjacent to the ocean, e.g. meadows/blackforest.

I think they're always good places to explore and uncover on your map.