Ranged carries are supposed to be safer. That's it.
So why do ranged carries have all the damage steroids? Yi is the only true melee carry because he has 3 steroids that all multiply each other, most likely surpassing ranged carries by sheer dumb luck, given Riot's balance directions.
Can Riot answer this?
Lil Lewd Witch4 votesWhut. Melees dont have on hit steroids? 
WoonStruck1 votes[{quoted}](name=Spase Blitz,realm=NA,application-id=3ErqAdtq,discussion-id=JyeEfAbn,comment-id=0002,timestamp=2016-03-02T19:28:23.037+0000)
Whut. Melees dont have on hit steroids?
They do have steroids, but none of them are as powerful as ranged steroids. I think you missed the point.
Steroids should be relatively equal in their sum on a champion's kit regardless of melee/ranged, with melee having the slight advantage, especially if they lack any way to close the gap. Ranged can afford to build more damage because they're ranged. No champion should inherently have more damage without giving something significant up. Yi is included; he is too strong atm.
Ranged to not have a trade-off for their damage anymore. Their base stats aren't poor enough to allow melee to lane vs them. Their skills don't have a drawback for being ranged. Their escapes often include very good damage alongside it, regardless of being used offensively or defensively.
ArlanKels3 votesPossibly it has to do with the fact that there is no real "Ranged" character. In the mid to late game players who can stay "At range" often require teamwork and extremely good positioning.
I say this because of things like Flash/Ghost and all the blink/gap closers that exist in the game. There are TONS of ways for melee people to basically force a melee fight on a ranged player.
Zarkkast1 votesI don't know where you got this from, but no.
And by the way "Yi is the only true melee carry" (he's not but for the sake of your argument let's pretend he is) because he deals as much true damage and is more toxic than both Vayne and Fiora.
legionnaire991 votesRemember xin release