ADC's Melting people-
I honestly don't fully agree with this statement.
Jinx late game can do a lot of damage_(late game as in 5+ items)- which I think is reasonable. She's not 3 hitting tanks. She's likely hitting you over 10+ times if aren't on a super squishy champ(Hurricane hits as well)
_
ADC's who I do/had see/n actively 1-2 hitting every kind of champ are/were:
,
,
, and 
Twitch gets 3 items and can melt the whole team with his stealth into ult.
Vayne gets 2 items and her Q hits for well over 1k
Draven is the same as Vayne
Cait has been pretty much been dealt with(nerfed a lot). To fully be that 1 shotting monster you had to be good with the 90 net and traps anyways (kind of a skill cap guess?)
Aside from these champs I really don't see people getting one shot from ADC's Kog/MF Are niche. MF: With lehtality she has clear strengths and weaknesses_(imo)_ Kog: is literally a A-10 warthog in league of legends form. (a plane built around a massive gatling gun, for those who don't know) Needs a rework for sure.
[vayne-pose]
Just my two cents from a support main actively moving into maining the carry position.