Well, if you die and didnt create a cache of spare tools then i guess you would have to start over. Thats a result of poor planning.
But yes, a crafting tree is needed. I wanted to do something like that in the last post you made on transversing the ages. The focus of this thread was just on primitive tools. This assumes you know how to make anything from a stone axe to a steam train. The other thread seemed more about starting with zero knowledge of tools and also on developing culturally.
Regarding the creation of cutting tools, in the real world you would spend hours of hand grinding stone on stone to create a shape. I'm not suggesting we sit in game for an hour to make one stone. That sounds like something you would see in Wurm which actually requires multiple players and to compensate for the diversity of crafting skills, long crafting times, and the detail of comstruction down to the individual nails. I want so see something not as tedious but fairly complex so we should reduce the time and focus on the crafting recipes. We shape stones to make a crude tool which can then be attached to a stick for added leverage. In grinding stone on stone, one stone is likely to be destroyed so it might take several stones to make one axe head.
I do like the idea of making bricks with our bare hands. Clay pots would also be nice to have.
I am curious of what your ideas are regarding how we should implement primitive crafting.