No composer would present his orchestra with a blank scoresheet and expect them to play - not even John Cage.*
Creativity requires constraints. The blank sheet of paper numbs imagination.
“Thinking outside the box”
“Pushing the envelope”
“Bending/stretching/breaking/re-writing the rules”
If you want the creativity, you have to create constraints people can work from.
Discipline makes daring possible.
*Cage’s box was for the audience, not the orchestra.