Yeah because of a better view an less cover - but keep in mind the world is hardly flat - that's why a shooter would be taking the higher position. there is always something in the way especially when you take hundreds of meters/yards into account. But as the illustration from the OP shows - your target size doesn't increase, quite contrary. Also it can move in more directions. Its definitely not easier to hit. Just harder to hide yourself.
Even fighting melee - the biggest advantage besides the additional fatique from holding your weapon/shield up and move upwards that affects the lower fighter is that the one with the high ground can go for the head and upper torso, while the other has most likely only the feet/legs in reach and has to protect the head. This would justify an advantage by D&D standards rather than for a shooter.
Last edited by biomag; 08/12/20 07:05 PM.