Singers who were big with a band or duo then struggled solo

Roger Waters' solo career can be considered a success on its own terms, but compared to the popularity of Pink Floyd it's a bit of a damp squib

Unfortunately, you are correct. I knew a lot of people who thought the band became Fake Floyd after Waters left and referred to their subsequent album as "Momentary Act of Treason". But the band sold out stadiums without Waters while he struggled to sell out theaters.

That's because they made an easily digestible, lush sounding album while Waters made a bunch of angry rants set to music. The Final Cut was pretty much the first Waters solo album IMO, and it's one of those albums you never see referred to as a favourite. I guess he decided enough was enough, which is why he's now settled for just regurgitating The Wall for the rest of his life.

David Lee Roth's solo career sort of paled in comparison to his Van Halen days.

"Just between the two of us, it's mostly for Fluttershy."-Discord

Bruce Dickinson's solo career was never as popular as his work in Iron Maiden. Which is a shame. Some of those albums are very good, Accident of Birth and Chemical Wedding in particular.

I really liked Bruce Dickinson's 1990 solo debut album "Tattooed Millionaire". Maybe it had a different feel because Dickinson was still a member of Iron Maiden. He returned to the group for the "No Prayer for the Dying" and "Fear of the Dark" albums before leaving in 1993.

Zack de la Rocha

That's because [Pink Floyd] made an easily digestible, lush sounding album while Waters made a bunch of angry rants set to music.
True enough. I refer to post-Waters Floyd as oatmeal for the ears. Moreover, Floyd had the name and the back catalog to draw from as post-Waters fans came to hear the band recycle the older material.

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"The past is never dead. It isn't even past." -- William Faulkner