My PPL instructor was a real hard-ass. He was always distracting me, throwing different situations into the mix and making me do 4 or 5 things at once. The moment I got comfortable with something, felt I had turned the corner, and thought I could really do this aviation thing, he would burst my bubble and ask that I do it at the same time as something completely new or in a new setting. It was frustrating, at times really sucked, and was challenging throughout.
Much to my surprise, every time I soloed, I felt like a much better pilot afterward. I was able to slow down and process everything he had taught me and practice without fear of prejudice or judgement. He would show me how to do it, I would learn and perfect it on my own.
When I finished the checkride, the examiner was very impressed that I didn't give in to the pressure that he intentionally exerted. He tried to rush me and see if I would crack. Whats funny was that I didn't even notice. I was used to the pressure of flying, managing the radio, and having somebody in my right ear making demands at the most inopportune moment.
Lets say you're in the pattern on base and just about to turn final. ATC asks you to turn and abort the landing to avoid a collision. You have passengers and what seemed like a very routine landing has just become much less routine. The urgency of the controller, coupled with coming up on final goads you into turning a little too hard for the circumstances. The plane doesn't care that you are inundated with passengers yapping their heads off, ATC asking you to do something you normally don't do, calculating your position and trajectory in relation to another plane, and performing an avoidance maneuver at a very low airspeed.
Turn a little too hard and the plane is not going to care about any of that. It will only care about the laws of physics and that will result in a stall or spin at a low speed and low altitude. An obituary usually follows. I feel that you will only fly as good as you train.