>>988259>>>988263So then why don't mountain bikes have wider drop bars?
Forward extension is irrelevant as it's harder to resist side to side movement than it is forwards and backwards when you have a hand on each side. What matters is width and in that regard flat bars are better.
Also it's not just the leverage that gives greater control but also the hand positioning and the more upright riding position (yes you can use the flats of drop bars, if you don't need immediate access to the brakes or shifter).