Actually, I think it's really important to have the commentators to discuss underrotations on air. Underrotations can HUGELY impact a skater's score, but are difficult to spot for viewers who are unfamiliar with the sport, especially in real time and with the naked eye. Having Tara, Johnny and Terry discussing underrotations in their commentary manages audience expectations re: scoring and could help minimize a lot of audience confusion when skaters receive lower-than-expected scores after what appears to be a 'clean' skate. After all, what's the alternative? Casual viewers will just think the sport is rigged and will probably quit watching in disgust.
I personally really appreciated having Tara, Johnny and Terry discuss underrotations in detail, including zooming in on the skaters' feet, pausing the replay when the blade hits the ice, etc. It really helped my friends (casual viewers of figure skating) watching with me tonight understand the skaters' technical elements scores.