Coldplay at the Superbowl

If you want to be considered a huge band, you have to play the Superbowl:
“Last Week Tonight” host John Oliver sat down with Seth Meyers on Tuesday’s “Late Night.”
Among other things, the former “Daily Show” correspondent Oliver discussed his fascination with the domestic spectacle of the Super Bowl.
“In most other sports, the sport is the key appeal. And clearly that’s not the case for the Super Bowl,” Oliver explained. “Americans just expect fighter jets and Lady Gaga now.”
Oliver added that he enjoyed the halftime show, but “as a British person, I found the appearance of Coldplay slightly excruciating.”
How is it that Foo Fighters haven't done it yet? What an omission. The biggest band in America should play the Superbowl.

I watched the performance and I really couldn't figure out what was happening. I gather that Coldplay appropriated Indian culture and then pretended to be really happy to be playing along to a backing track of some sort. What's the point of playing a song or two and then leaving?