I think Riot did balance something correctly...
The ranged minions have double the ad of the melee minions, but half the attack speed. [sg-lux-2]
Its as if they know that ranged is op, so not only is the melee minion tankier by a significant ammount, but it also has the same damage as the ranged minions. [sg-ahri-2]
Now we just need to make champions the same as the minions. With mobility being a function of damage, the higher the mobility, the less damage. [slayer-pantheon-popcorn]