They just don’t make sense IMO, so it’s fair to not have these.
I also don’t mind legendary tools not being a complete set, but craft-able ones from iron to obsidian could see that.
Nonetheless, you most generally don’t need the Maw of the Hyena, a Star Metal Cleaver is more than enough, and yet we have an Eldarium Cleaver from Siptah 
On the other hand, skinning knife is available in obsidian and black blood, but not eldarium.
Still, really don’t mind because the really important tools are always available, and those are the Pick and the Axe.
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