The game has a lot of them surprisingly. They are just items in the game that either are not worth using, or they require too many resources.
While it is true that playing longer sessions will eventually lead to an abundance of resources. Most public servers do not last past winter. And in general, it makes little sense how the resource requirement of certain items just, scales up sharply for no reason at all. While other items have just unbalanced features in general.
Some examples would be the Piggyback. If the developers increased its resource requirement, and removed its negative effects, it could be a legitimate second tier backpack players who save up or survive long enough can get. Instead, never really used. Why be slower, that means every trip will be longer.
Oh if you wield the walking cane you can move around just fine with the Piggyback. Well then why do you not just get rid of the Piggyback and fly around the map with the cane with a mere four less inventory slots. anticipated counter to generic everything-is-useful commentors
Also have the Bat Bat. Lots of resources, few uses. There is also Smallbird raising, which is just a challenge instead of a real beneficial mechanic. Same goes for Beefalo riding, takes up too many resources and is completely finite. Farm pits, lots of resources required yet they barely produce any food; ever. Why make a bee mine, when you have tooth traps. Why make a bee box, it really does not produce anything you need that is worth sacrificing the time over doing something else.
Honestly backpacks in general should be nerfed. They pretty much defeat the existence of torso items in general, can just use a thermal stone to substitute for warm or cool tops. Can just swap back and forth between the backpack and torso armor. Unless the developers intended for backpacks to be the base, always present lifeblood of the player; it really should not dominate the scene as much as it does over everything else. Again, less variety in how people play the game because of this.
The game has a surprising amount of things like this. If the Piggyback and Beefalo riding features had their negative and finite aspects removed, and their resource requirement increased, they could become legitimate higher-tier features of the game players could work towards. If the Bat Bat did not cost such a ridiculous amount for so little use, it could be an actual weapon players use. Instead these items have mixed requirements and aspects; which leads to them being completely cosmetic or not even worth getting to begin with.
General discussion and references to other items in the game which could use improvement would be useful for bringing more attention to this.