Totally agree with everything that you guys have said. But most listeners don't know about flow, structure and what a hook is. The listener (and any songwriter/music lover for that matter) wants a lyric they can connect with. It's all about how it makes them feel. Most people say "oh that's a great song" or "I love this song' don't they when they hear it? Or if it is an instrumental piece its the emotion or journey they are taken on. They can't explain 'why' it just 'does' for them.

Now if you can combine a lyric they connect with and musically it stirs some emotion(s) you have a timeless song.

Anyone rememeber Nirvanas "Smells like teen spirit" or "Sweet Home Alabama" by Lynard Skynard?