Why do lyrics matter? Easy, they are supposed to work with music to complete the "vehicle" of delivery. Sometimes the music comes to the driver's seat of the vehicle and sometimes the lyrics are in the driver's seat.
JB73, Soma is one of my all-time fav. tunes. Are you talking about:
"So let the sadness come again
On that you can depend on me
Until the bitter, bitter end
When good sleeps in bliss." This part?
Take "Unknown Soldier" for example. Without the lyrics this blatant Vietnam War protest song wouldn't be a good tune. The radio stations had NO IDEA this was a protest type song and played it routinely back then.
Arlo Guthrie, Warren Zevon, Dylan, Jim Morrison and Bernie Taupin are lyrical gymnasts. Doesn't matter the lyric structure, they all work. They are geniuses.