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The higher modulation scheme only buys you an extra 33%, but it requires 5-7 dB higher performance. Given the somewhat higher noise floor in 2.4 GHz, that's a pretty high bar for a small return.
And you can't even begin to think about wider channels -- the 2.4 GHz band is only 83 MHz wide, so running an 80 MHz channel requires that the entire 2.4 GHz band be free. That just won't happen in the real world unless you're in an RF isolation chamber.