To go a bit further down this rabbit hole...
A professional pilot with thousands of hours in type has no problem reading back a landing clearance in difficult landing conditions ( it is in fact required by the FAR's. not doing so at a class B airport will have you in serious hot water!) again the control inputs required occur without any conscious thought, but the lower time pilot is often at task saturation during that same landing... Add that radio call to his task saturated mind and things fall apart.
Perhaps the very skilled shooter can tolerate some thought distractions in much the same way, because watching the sights and trigger control happen correctly without conscious thought.
When I was getting my PPL, I was so focused on landing during my first solo flight that after I got off the runway, I realized that I was hungry, had to pee & my jaws were sore from clenching my teeth. I've never experienced that level of concentration on a single task in my entire life. God how I wish I had the money to keep flying.