I disagree. Not only did he continually & substantially contribute to Picard's character, it clearly aligns with his own values and ethics as demonstrated over and over in interviews. Why not both? That seems like the obviously best perspective.
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.