Post-breakup Beatles songs revealed their entire dynamic. George Harrison immediately drops All Things Must Pass and it is three whole albums of solid gold. John Lennon cranks out a few mildly trite pop songs (including a much better Christmas song than that) before his untimely death. Ringo takes the money and basically retires to a private life of happiness and joy.
But Paul McCartney, legendary singer-songwriter, and no stranger to experimentation or collaboration, begins a long and varied follow-up career of absolute crap. I don't understand how someone so demonstrably knowledgeable and talented achieves such consistent mediocrity, but in the absence of an equally egotistical genius to tell him off (and a polite wizard to feel challenged by) he was just useless. Wings goes on for a decade and produces maybe half a dozen decent songs, one of which is this Tame Impala anomaly nobody remembers.