bars do have internal gussets mate. my slam xlt bars on my bmx have 8 or more. what i mean is take say a element nickle wide bar, they are sweeping back from the stem whereas say a burgtec bar they are sweepinf from the first knuckle or bend so as you have just said the greatest moment on a stress raiser is going to be on the element nickle wide bar. fact.
while i agree with the principal of what you're saying. whilst you say engineering fail to me (i am an engineer and i am about to start my masters, i have industrial experience) the shere number of bendy bars and the amount of fea going in to these product these days actually says fail to you.
clubber also jmc died in 94 and he was using mx riser bars on his bike. i didn't start riding until around then so that could be the reason i love them so much. just get low rise bars and suck up the fact that they are better.
rudi boy, no one on the world cup circuit uses them, if they were that great every bar manufacturer would make them and use them without exception. so there is no precident to show that flat bars are better.