Heh! Everyone's reasons will be unique. In my case, I ride 'hybrids' simply because for no good reason that I've ever heard road bikes with flat bars/bar ends, as opposed to drop bars, are classified as 'hybrids'.
Makes no sense to me, but there it is. My bikes are a 'hybrid' of nothing; they are road bikes: gearing, tires/wheels, ride position -- 'road bike'. They are designed to be ridden on roads. And yes, even at my advanced age I still stuff my decrepit carcass into lycra, and clip-in to my pedals.