In Nashville, there is a historic tendency to work the lyric to death while settling for music that works. In pop or rock, it can be the other way around.
[Non-performing songwriters] climb the mountain the first time, take their successes in stride, and when they tumble down the mountain, they just consider the tumble part of their profession and don't even waste time mourning their slump. They continue to write, make new connections, and move forward toward a new round of success.
Especially on Broadway, composers and lyricists fretted over their creations, obsessed over every rhyme, every critical chord or interval. The stakes were so high. On Broadway, people were watching and judging, especially newspaper critics who knew a thousand ways to slice and dice a songwriter for the entertainment of hundreds of thousands of faithful readers. There was no anonymity for the Broadway songwriter. Even the best could find themselves stripped naked the morning after by the tastemakers and their readers.
Songwriting is a craft. Writing good songs on a a consistent basis doesn not happen spontaneously. In fact, most of our best songwriters learned to write good songs by writing a lot of not so good ones. Education matters in songwriting, just as it matters for physicists, chemists, doctors, lawyers and MBAs. Education lays the foundataion on which to build experience.
Here's some free advice; like the folkies of yore, you need to be not just a writer of songs, you need to be a lover of songs, a listener of songs and a collector of songs. If you hear a song in a club that knocks you out or you hear an old recording of a great song you never knew existed, it does not diminish you to record it; it actually exalts you because you have brought a great song from obscurity to the ear of the public.
That is what diminishes the artist and his song. The artist is now hermetically sealed. The publishing company got him his deal and they expect to profit from his songs. So what if he is a better singer than a songwriter; let's put him in a room with a real songwriter. Something great is bound to come...except very often nothing great comes out of such contrived match-ups. Nobody knows where a great song comes from, and that's why so many writers credit the Lord as a co-writer (though I notice they never offer Him half the writer's royalties) when they come up with a real gem.