Don't get me wrong she negotiated 400 hurdles in under 51 seconds no doubt about it. The reason why it's not as significant is that she barely dipped under 51 with what a 50.96 at favorable. Altitude.
Now look at the rest of the results from 100m to 400m ALMOST every winner posted a personal best and some very significant. In the 100 hurdles two woman ran lifetime best, 100 and 200m a 20 year old ran his first sub 10 and sub 20, 400m flat female winner another lifetime best. The condition of Altitude significantly INCREASED their performance which NONE of them had been close to at sea level.
Even Femke slashed her personal best by .50 seconds due to the altitude; however, Paris Olympics aren't at altitude, my friends and Sydney just ran her WR at sea level this year.🤔. I like Femke but let's not make more of this than an AIDED personal best.