Boy......I could write a book in response to that. The operative word, that he uses over and over again, is "practical". He's decided what "practical" is, and he has gotten to the point that he has achieved that with most any reasonable full size weapon. The problem with that is that he's no longer challenging himself. He'll never get past where he is, because he's decided he's arrived.
In short, his standards are too low. If you want to get better, you have to drive yourself. I promise you, Rob Leatham never thinks he's "good enough", regardless of how good he is. When I get to the point that I'm hitting 90%, I either cut the size of my targets, or increase the range. If you don't keep score somehow then you don't know how good you are.