Oasis would never have released Don't Belive the Truth if they'd stopped after two albums, which I think's a fantastic album, so I can't say I agree with that one. Road To Rouen is one of my favourite albums, so I disagree about Supergrass too.
U2 I can vouch for though. The Stones should've called it a day after they released Tattoo You as well. Another one that springs to mind are the Flying Burrito Brothers, and their thinking they could keep going without Gram Parsons or Chris Hillman.
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