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That's why I say some aspects blur the lines (time management being one fairly clear example). Mechanics can have both in-game effects and meta-game effects.
You make some good points, I think.
For me though, it's a matter of convention - "system mastery" has been used for years and when someone claims to have it, I don't think many leap to the idea of "A-ha! That player knows not to use summoning spells in the last ten minutes of a PFS slot!"
I fully agree with you that such considerations make you a better player - but I think the horse has bolted on the phrase system mastery. That's used in a much more limited sense, imo (without disagreeing at all that being a good player involves an understanding of such meta-game issues).