I just don't really get what you mean. How is it metagamey? Do you just mean that it makes you more aware of the rules?
It removes any consistency in how powers operate within the default milieu of the edition. Instead, how powers function are defined ex post facto in a very gamist manner which dissociates the player. The ability of players to realize an invariable framework from which to build their creative-interactive experience as the character defined by their player sheet is destroyed by a DM-Fiat option that reveals the world as an artificial construct.
I just think such mechanics should not be given a place in the core system. For gamers who like such things, they can be given some sort of expansion module.