Maybe some will chime in. We are talking precision rifles, not 3 gun using red dots where center mass on human size target as fast as possible is sufficient. We are talking rifle competition where groups are measured in decimals of an inch not time.
Handguns of course brakes will help, rifles in 3 guns and speed competitions will benefit from brakes. However, I wouldn't guess he bought a Magnum Bolt rifle for speed competition, would you?
Who's "we"? OP didn't state it.
OP also didn't specify "competition" use.
I don't understand the harshness?