From my empirical experience 3 piece Bands tend to be missing a 4th member.
When the one and only Guitarist stops playing Rhythm Guitar to play Lead Guitar then there is a massive whole in the sound.
Led Zeppelin are the best example.
It's OK in the studio, because the Guitarist can play multiple tracks, filling out the Band's sound.
Though on Zeppelin's 1976 Movie " The Song Remains The Same " the most ironic title I've ever heard, the sound is atrocious, because Jimmy Page can only play one Guitar, as opposed to the multiple Guitars you can hear on the studio albums.
Jimmy Page is a great studio musician, though it is a physical impossibility for him or any Guitarist to play Rhythm & Lead at the same time.
Green Day have the decency to have a Touring Guitarist on stage.
ZZ TOP had a 2nd Guitarist playing ' in the shadows '
U2 have a multitude of musicians playing under the stage.
Bono thanks them at the end of the gig.
I won't list them, though I can think of a hundred Bands that have two Guitarists.
I shudder to think how hollow and horrible they would sound without the 2nd Guitarist.
I imagine they would sound as terrible as Led Zeppelin LIVE in Concert.