Some of the “reject” songs The Who did are great.
Have you ever heard “Melancholia”? How the heck did that not make it onto an album? Perhaps Pete thought it too dark. But it’s now become one of my favorite Who songs.
I first heard that one on Thirty Years of Maximum R&B, then it showed up on the expanded Sell Out. The one that kills me is After the Fire, which never had the chance to show up on a Who studio album (though there are some live versions around).