It seems like it should be important, for reference, I just wonder how so many songs which are huge hits are called "one" "You"
"both" "without"

Funny when you look up the subject they stress it as important, but reference songs from the 70's when doing so.

Yeah, Hotel California, Bat Out Of Hell, Oliver's Army, Cats in The Cradle, see the trend? Songs used to be better, the songwriting was ten fold better than today.

Today u get by with "Talk"

Im sure its important for songwriters trying to conduct business, but not for art of the song.