The game does a good job of making every biome useful for something but it feels like the balance of usefulness in a normal world is really awkward.
So, deserts provide bones, rocks, ore, tumbleweed, cactus. Plains has bees, berries, all the normal resources. Swamp has reeds, spiders, tentacles, merm. Spider forest has spiders, lesser normal resources, graves, pigs.
But the savannah, deciduous and mosaic are really left out?
Savannah has rabbits, spiders and beefalo, but the only many resource is grass. So, outside of acquiring grass a savannah biome in itself has no inherent resources players will want. And since grass can usually be found in the plains it matters even less.
Deciduous has birch, pigs, catcoons and mushrooms, with some lesser resources. But in the end players normally only go to the deciduous for Glommer or the King. Catcoons are good for meat and birch for trail mix, but both of those sources are obsolete compared to most others in easier places. The biome itself has virtually no resources that are valuable enough to encourage players to go there. Which is the big reason why generic Pig King bases are so unethical because the deciduous biome itself has no majorly useful materials for players to sustain themselves with.
Mosaic has rocks, and a graveyard. Personally hate the existence of this biome because outside of the graveyard; there is literally no beneficial resources for players to gather while they are there other then rocks. Which is what the rockland is meant to be for is the prime rock source, so the mosaic is basically a second rockland pretending it is something more; with a graveyard as attempted evidence.
It would be cool if they maybe "buffed" these biomes to give them better resources. Perhaps the savannah could have more rocks and rare gold veins to make it a soft-rockland, the deciduous could have significantly more mushrooms and inherent juicy berry bushes, and the Mosaic could have less rocks but more random resources. Just something to make these biomes more useful on their own since they currently feel like dead-zones in the world where there are only specific reasons to visit them, which often are unrelated to the resources of the biome itself.
Savannah would give players a more lenient access to rocks on-the-fly, players could visit the deciduous for the unique mushrooms and gather berries while there, and the mosaic would just have general useful things for players to gather.
Although it would also be useful if catcoons occasionally spawned in the plains, since they are a pretty generic mob yet they are confined to one biome where they are rarely interacted with.
Not in Suggestions & Feedback because this isn't a statement of a suggestion it is more of a question on whether people feel this is an issue.