Most guitarists have enough struggle with one neck. However, there are times when you might have to play guitar and bass in the same song, or play delicate fingerpicked intros on a 12 string, and rock out with a great big Rockin’ Guitar Solo on that 6-string in the end.
Ahh, progressive rock. Never has there been a movement in contemporary music that was probably more hated by critics, real punks, and hipsters. My guess is that either they didn’t quite understand it, or were threatened by it, but progressive rock (and we are talking vintage here) influenced bands like Black Sabbath, Iron Maiden, Dream Theater and every progressive metal band around today.