All Peacock and Walking on Air have in common is that they're both Katy Perry album tracks whilst This Is How We Do and Peacock are both childish and the two worst songs in her discography that would absolutely destroy her radio power if either were ever released.
1. Lead single in December, get that 500k+ week after Christmas sales
2. Second single with a feature a week or two before super bowl to be performed at Super Bowl
3. album release day after SB, 3 million in sales and snatching Taylor's wig right off her flat ass