String material would have some effects on this topic. If I'm not mistaken linen or other plant fiber strings were used with the original war bows. These strings would large diameter and more surface area on the nock(softer). Most modern war bows are strung with fastflight or other minimal stretch, synthetic strings(harder). These have smaller diameter and less surface area so more wear. On wood like yew, especially, the protection of horn(or other suitable material) nocks would be a necessity with modern strings. IMO
Also, were the horn nocks on the war bows as ornate as the modern horn nocks? ...or is the ornate horn nock a Victorian target bow hold over?