Something no one ever thinks about: Though Felix was on the world record setting team she really does not have much relay experience when compared to most world class female sprinters.
While at LA Baptist in High School, she pretty much was the entirety of their team, which rarely ran relays at all.
She skipped college track all-together, so she had zero college relay experience.
Her leg on the world record 4x100 was amazing, but she was a completely different level of "fast" that year. With a running start she was as fast as any woman in the world; that is not the case now.
Jenna Prandini, and EVERY OTHER female sprinter available for the US relay pool, have much more relay experience that Felix. When you think about it, it's quite possible that Felix has run under 15 4x100 relay legs in her entire life! When you couple that fact, with the fact that she is not currently one of the US's fasted six women in the 100, it seems a horrible decision to run her at all.
All that being said, I love Felix as an athlete and a person, but the US continues to make poor relay choices. I've been a sprints/hurdles coach at the HS level for 24 years. One thing I know, the 4 fastest kids in the 100 are not always the 4x100, but it is extremely important to have the right parts at the right time. The most inexperienced member of relay team is both taking and giving a hand off on the biggest stage of all, something she has struggled with before, and yet, here we are.