I have to agree with OP. For a game that emphasizes certain things, like leather, crop rotations, cheese, weather, ect but ignored others like tool maintenance feels a bit off.
Stone tools break plain and simple. So should be left the way they are. Softer metals like copper and bronze should need to be re-forged if they break. Or not. They could just be a stepping stone to iron but that's where things should probably change.
Iron tools and above should need re-handled, sharpened and maybe refaced in the case of a hammer. I think at least a sharpening kit would help for some field repairs. Up the durability of hammers. Have a powered grinding wheel for things like chisels and blades to sharpen at home.
There are plenty of mods that do these but none do it perfectly or are close but not updated.
These are just my meandering thoughts on this aspect of the game. Maybe disregard anything below Iron and leave it the way it is but once you get Iron it should feel huge. Right now the tools are just a bit faster with a bit more durability.