On metagame mechanics: I agree with
Ron Edwards that "I tend to think that the main issue, basically, is who is considered to "spend" them - character or player."
Who Spouts Lore, the player or the character? Answer: the character.
Who spends an OGL Conan fate point to make it true that an ally is there to help the PC break out of prison (I take that example from p 68 of my original printing of the rulebook)? Clearly it is the player.
Who, in BW, hopes to meet a friend who will help them (thus triggering a Circles check)? Answer: the character.
Who, in 5e D&D, spends a use of the Lucky feat to get a reroll? Answer: the player.
Who, in AD&D, prays to a god for divine intervention hoping to get a reroll? Answer: the character.
Who, in Apocalypse World, performs the Harm move whenever a PC takes harm, to find out exactly how bad it is? Answer: the player. (The characters efforts to avoid harm have already been played out prior to the Harm move being rolled.)
Who, in Classic Traveller, uses their familiarity with sub-cultures and the lower classes to pick up information about where contraband and forged documents might be obtained? Answer: the character.
Who, in 4e D&D, spends a use of Come and Get It? Answer: it depends. If the effect, in the fiction, is that enemies charge the PC of their own volition, it seems the player did. If the effect, in the fiction, is that the PC is wrongfooting his enemies with his deft polearm work - and this was the typical effect in my game - then the character.
This all goes to
@Campbell's point not far upthread, that the differences between these things matter.