I think there could be some way of repairing tools, it doesn`t make sense to me that when an axe/pickaxe/etc breaks it just disappears?
There could be more mechanics to improve on that, like maybe a grindstone, who would able to heal your tools to full durability very slowly, but the higher the current percentage of durability of the tool, the slower the grindstone would "heal" your tool, and vice versa.
Another solution would be when a tool runs out of durability, the handle breaks, returning you maybe some kind of damaged variant of that tool metal part, witch you could reuse in a new one, maybe this would even open doors to a system of tiers of handles(Not the focus of this suggestion), like a stick(level 1?) and a treated wood one(level 2?) for example.