You know this is just the observation of one man.
For all we know the next class he teaches the (insert brand name/pistol type here) will be the ones with the most failures.
All mechanical devices will fail. That is one of the proven truths about life.
Train hard with what you got. Maintain what you got. If what you got breaks down in the heat of battle transition quickly to whatever else you got! Fight to win, win to survive.