The problem isn't so much the writing of the songs as the fact that some people attach exaggerated importance to the written version. I was once criticised in this forum for not quoting the "official version" of a well known song - I had written the words from memory.

A good singer uses the words like a good cook uses a recipe. A bad singer uses the words like a chemist uses a formula.

One of my best friends, a fine singer, always has the words open in front of him when he sings, in case he forgets. He seldom forgets, but he very seldom sings the actual words on the page in front of him either.