In a sense, the Derby needs the expanded coverage. For 90% of the audience, it’s the only horse race they see all year. They know absolutely nothing about the horses involved, the trainers, the jockey, or anything else about the race. None of the horses are the same as the previous year. In order to appreciate it, they need to be brought up to speed.
The SuperBowl, OTOH, 80% of the audence has watched football at some time that year and know what teams are involved. Whereas probably about 1% of the KD audience has seen any of the horses run; I’d guess well over half the SB audience has seen at least one of the teams.
So the KD padding is necessary, but the SB padding is just an excuse to sell more products.