These certain un-used items can find its way into the game, if we take a look at classic pickaxe for example. These items mentioned in this topic however, were made before the launch of the game, certainly was made as a concept to test out the graphical style of the game in order to forward it further to mix into the game’s aesthetic, that way they could potentionally consider the artstyle finished.
It’s unknown when this update will happen since it was brought up several times, certainly farming suggestion by LMO Farming Update Suggestion
have several additions to the pre-existing concepts giving them more depth is a way to revive them for
the game’s progression side, is the right way to make a formal suggestion for them. Of course it’s still up to you to decide whenever it benefits you or for the community in general to let people hear of it.