When Waters took off, his solo albums showed that he's one of those musicians who needs someone to reign him in, a partner or producer.
Gilmour's Floyd showed how easy it is to fake "dark" lyrics--the lyrics stink--but even though Floyd's songwriting wasn't as strong, it still SOUNDED like Floyd. But the magic combination was gone, so it's been just a fake Floyd since The Wall (I hated The Final Cut--all gloom).
"fake Floyd since The Wall"
I despise that album. It isn't Pink Floyd.
Same with Lennon and McCartney. You have to have the other person to filter out your crap, as Macca and Lennon's solo efforts clearly showed.