The announcers here are right: if Simone struggles on any event, it's bars, simply due to how much power she has (and power is hard to control). It's also worth noting that bars is the only event that she didn't place on the podium for at the 2016 Olympics. This particular competition, though, was Simone's debut as a senior in women's elite gymnastics, and it's one of the cleanest bar routines I've seen from her (i.e. her lines are straight, and she makes her release move connections). The fact that she could hit a bar routine like this as a gymnast in her first year on the senior elite level is one of the reasons why she's proven her greatness from the beginning.