I had an idea for a tool rework.
When you make a tool head it instantly is a tool with three new stats, hardness, sharpness, and mass.
Hardness is the most important stat, deciding the maximum sharpness of the tool, how likely it will lose sharpness, and how likely it will accrue nicks or brake entirely.
Sharpness decides how fast the tool is, how much damage it does, what damage level it has, and what block braking level it has. Tools can still mine blocks with a higher block level, but with significantly increased chances of nicks or brakes.
Mass is the overall material in the tool, lost when it gets nicks or when you use a sharping stone. Starts at 100.
Also if iron tools get left out in the rain and temporal storms they could rust, losing mass and sharpness.
Im thinking cutting trees should have a decently high block level, while branches and leaves will have a vary low block level.