I am not advocating for people to not run fast in training. I am saying that due to the lack of adrenaline and other factors, people do not run as fast in practice. If you are having people race in practice, then you’ll have different results! I am talking about practice where people are generally running individually. Even when competing against others in practice, few run close to their best. I’ve experienced this myself and have talked to two guys recently who have run 6.5s in the 60m and neither approach their competition speeds in practice even when they are trying to run “fast” 30s, 60s, or whatever else. Most people do a crappy job handtiming in practice anyway. I’m talking about times either taken from video or timing gates.
Loren Seagrave has also said that none of his athletes come within something like 2-3% of their personal best in practice and most are something like 4-8% off for the majority of their runs (even when trying).