This reminds me of how it's a software developer's ultimate power that he or she gets to bring the vision to life. If you disagree with the implementation of a requirement, you can build it the "right" way, and let them choose to fire or replace you. If your judgement is good, they probably won't.

Similarly, Patrick Stewart assumed a written role, but he was responsible for its ultimate execution, which have him influence over the immediate execution in small ways, and likely, increasingly powerful influence over its future execution.

He deserves a great deal of credit for how Picard ultimately came to be represented.