I agree with a lot of this. But I think it is more of the timer not being used well. Once a person is keeping their rounds during slow fire on a reasonable target (6"/8") then I like to see every round timed. At first they will make the easy gains on the timer and then those increases will slow down. I remind people that the purpose of timing every round isn't just the fast. But I am also a strong proponent of chaos/interleaved training. That type of training actually inhibits one's fastest time. But what it does show is the time of your screw ups. For me fixing the bottom line is better than having a world record time.
Both are important but IMO raising the bottom end of one's time is the most important.