I read
@hawkeyefan's question as being addressed, ultimately, to the player of the character, not to the imaginary capabilities of the imaginary characters. I read
@Maxperson as interpreting it the same way, given his references to
roleplaying and to
mechanics, which are phenomena that obtain in the real world among the players, not in the imaginary world of the characters.
With that perspective established, I take hawkeyefan's implicit point to be that the player of the high level wizard has a great deal of agency to declare changes to the gameworld - creating things, changing things, destroying things, moving different people here or there, etc. Whereas the player of the low level fighter does not have comparable agency.
The fact that the player of the fighter can, through a particular technique, bring it about that the GM forms a view about what should happen to the gameworld seems a much more oblique type of agency to me!