If you have driven the car in actual fog (I have and own one myself, Also work for Lexus) when you are in fog and toggle them on and off you should see a difference in your lighting... Understand Lexus doesn't spend millions of dollars designing and creating a new vehicle without extensively testing every aspect of it....
Moving on to the fog lights themselves... the reason they are pointed more towards the ground and not straight out, because your actual headlights beam at an angle obviously further out from the front of your vehicle... if your fogs were pointed upwards the beams of light would mesh and cause less visibility not to mention blind anyone and everyone in oncoming traffic towards you...
Like i said i do work for Lexus and see nothing about adjustment of the fog lights, if they don't do anything for you or are "less than useless" I suggest just leaving them off
