Some I have had to cut off, since they were too large to just grind off efficiently. It is an important safety issue. Some of the overhanging metal can be quite sharp and cause nasty cuts. Some pieces can go flying off when struck. As a practical matter, they also prevent penetration when the head gets down to the surface of the wood.I did the same, almost always had to grind off humoungouse mushrooms.
Sorry that he did not appreciate your intent.I was so proud of my work and couldn't wait to show him. I still remember his speechless reaction - not good.
Philbert