We often read about or have to sharpen knives with chipped edges. This situation is far from new. It predates the use of iron and steel. This video talks about bronze age weapons and tools.
https://youtu.be/Wj6KwtGx6DE?si=tc_fqRxnD-BZJtFF
Ken
When researching my introduction to abrasives there were references going back to at least the neolithic. In the late stone age people discovered that if they sharpen their stone tools they became more efficient. I watched a Time Team episode where they compared a flint napped axe with a similar flint axe sharpened and they found the sharpened axe much more efficient.