"Once they lost the brand, their lack of talent was exposed."
Which is why McCartney had success after success in the 70s and later on, and Lennon wrote one of the all-time songs of the century with "Imagine," which charted at #3 on Rolling Stone's Top 500 Songs of All-Time...
Higher than the highest Beatles' song, Hey Jude, at #8 (the Beatles still had the most songs of any band, with 22.)
George Harrison ALSO had a successful career...
And all Ringo's wanted to ever be is Ringo, lol, not like the guy pretended to be the deepest artist ever.
But Lennon, McCartney, and Harrison were ALL recognized widely as successes after the Beatles.
You just hate their music, which is fine...but you can't spout untrue crap like their lack of talent was exposed--they continued to have hits...so either 1. They had talent, or 2. Their lack of talent wasn't exposed because they did keep having hits.
Beethoven should still win this in my opinion, but really...
"Greatness requires an ability to stay together longer than 7 years."
What about the likes of Wilfred Owen and John Keats--dead 25 or before, they didn't have long careers, but Keats especially stands as one of the most notable poets of his time and in the English language.