Thunderlords Grinding My Gears

One of the things i have never understood about TLD is why does it do the same amount of damage for a ranged champ as it does a melee champ? To me this just doesn't add up.

As a melee champ in lane I already have to put myself at risk to gather farm while being whittled down by your AAs or if I want to trade with you there is a pretty big gap that I have to close in order to do so, which if played well should not be an easy thing to do. So why is it that ranged champs who already have arguably the best defensive stat in the game, range, also deal the same amount of damage using TLD while being able to proc it from such a safe distance at ease with little to no drawl back. Ranged champs could already bully and punish melee champs really hard early on, TLD literally just becomes Free damage for them to bully melees with more ease.

I don't think that the mastery shouldn't be good or viable to ranged champs, but I don't think that they should be able to have such easy access to free damage. To me ranged champs should still be able to proc TLD just as easy as they can now, but at the cost of doing like 3/4 the damage of a melee champ using TLD.