Songs need to have the ability to change and to grow for sure. They take on lives of their own. Some songs just don't have that capacity. They're locked within a period of time. And as soon as you take them out of that period of time, they die very quickly.
The more information you have, the more human our heroes become and consequently the less mysterious and godlike. They need to be godlike.
A rock musician's career is short-lived. To extend it, you need to do other things to keep yourself fresh.
They all have their share of thoughts about what needs to be done. So we just ignored them.