It's not something I would do. I have had the occasional hen receive some cuts to her side due to incorrect rooster/cockerel mounting; it's often because the male hasn't positioned his feet correctly on the hens shoulder, but a few minutes with a file takes off any sharp edges and the point. My fault for not keeping an eye on the roosters spurs.
I've read that some people have removed a roosters spurs because they thought they interfered with it's ability to walk.
Roosters learn how to 'roll' their walk as the spurs grow. They've been doing this since the species grew spurs.
I've read here that someone cut a roosters spurs off because they got one dug in them when handling the rooster. The answer is learn how to handle the rooster, not cut his spurs off.
I've also seen the great pick and mix disaster where the keeper has got a rooster that is a different breed to the hens and much to large to be mating the much smaller hens. Obviously (although apparently not for some) the rooster isn't able to place his feet in the right position because his foot span in mating position is wider than the hens shoulders and he supports his weight on his spurs. Kinda easy solution is pick roosters suitable for your hens.
I've had lots of
roosters here and they've grown all shape and sizes of spurs and I have never had to cut a single spur.
Finally, it may not apply to those who keep their chickens in coops and runs, the rooster has spurs so he can use them to defend himself and his flock. A rooster without his spurs is at a major disadvantage should he need to fight.
