To me with my minimum experience of 40 years of competitive shooting there is a BIG difference between a malfunction and a parts breakage. I was regional IPSC champion in the mid 80s, before some of you were probably old enough to buy a gun. I have been successful in all handgun sports except 2700. I own my own range and live on it. It is fairly accepted to be as nice as any in this county. Have been able to shoot daily for the last 15 years and do. So I think I can pass the how much and how good are you test.
Now to the question, If a system loads, fires, extracts, ejects, and repeats this cycle for several thousand cycles without a malfunction, it is indeed a well thought out system. I promise you if you continue to do it long enough, you will have a Malfunction, or maybe even a parts breakage. There is no perfect system that I have encountered,BUT ,some by brand, are better than others. We see LESS troubles with Glocks, Sigs, and Berettas than other brands. None of them have ever been proven perfect here. I am not a Glock fan in all their models. I have in the past owned all models by calibers but the Long and slotted ones. They usually get traded off along the way. All knowledge does not flow from this fountain. I do think I have earned my opinion instead of being told by someone who knows nothing about me to "shoot more"