The OP is obviously an extreme outlier in commuting 40 miles a day. The standard commuting bikes used throughout the world for at least the last 100 years have almost universally had some form of flat bars.

In my experience of having commuted by bike almost every weekday for 20 years and using just about every conceivable bike configuration (track bike with tubulars and one brake, various road bikes, mountain bike, and hybrid, all with their stock handlebars), the ideal setup turned out to be a combination of flat bars and add-on aero bars. Safer than drops in the city, faster than drops elsewhere.