Just going to poke my nose in and say that while the game does have options for ... 200%, 300% more durability, I think the point here is that I have had my firewood axe in real life for 25 years, it still works just fine and it will still be chopping 25 years from now... that's the point of inventing steel in the first place, better tools So I agree, no amount of grass cutting should ever break a good tool. (Although having the handle break and having the tool drop a head that needs a new stick would be realistic)
Maybe a solution for mod makers could be adding a 'hardness' value to each material and if you are using a softer material on a harder material it breaks or degrades, but harder tool on softer material == no durability loss ... Just a suggestion