I mean voters are not all experts and aware enough
that's the point, you are expected to be expert enough to just separate better from good or worse in scale, because noone really knows how to do the job well, that's why we have lots of people voting and local governments and parliaments, so they can tackle problems by collective mind, president there is just a cherry on top to show directions where to go and a person of contact for international affairs, you can't do all it alone well, but no one expects you to, when you are elected.