Vayne rework needed?

I also posted this on reddit if anyone likes this please upvote it: https://www.reddit.com/r/leagueoflegends/comments/4whj04/vayne_rework_needed/?st=irjm7hec&sh=f2cdf43c

So I've been noticing a reoccuring thing now with riot and how they fail to balance with range. Ryze is a short ranged mage, vayne is a short ranged adc. Both have low winrates (Vayne 46%, and Ryze at around 36% when I last checked).

I understood the game like this: Short range should deal more damage up close Long range should deal poke style damage from long range but it should be half that of up close damage.

Now explain to me why a champion like Jhin can completely one shot a vayne from 9000 miles away using his combo of either:

1. Ulting until she dies
2. Auto, q, w
3. Four autos

So for some reason 6 auto attacks from vayne does half the damage of 4 autos from jhin (both champions full build).

Two silver bolts should deal more damage than one jhin combo... but no... Even in the late game he triumphs over vayne. Vayne is a hyper carry who can't actually carry. Invisibility is useless with pink wards being 75 gold this season and sweeper upgrades being free.

This is literally the same story with Ryze. Ryze got a rework which made him WORSE??? WTF RIOT? Lmfao...

So before rework he was at a stable 46 to 48% winrate. After rework he is at around 36% winrate.

It's basically the same thing, a Xerath can kill a ryze from 900 miles away with his combo, and a ryze who gets on top of a Xerath can only do about half of his health bar.

Ryze and vayne are basically the same champion, short ranged carries which can't actually carry. Even Gosu admits that vayne is trash and I have checked his winrate with her on one of his accounts and when I checked his winrate from like 50 games was like 36 or 34% if I remember correctly.

So riot, what's the plan? Am I wrong in thinking this is how the game is balanced? Like I said I always understand it as: Long range, less damage, short range more damage but risk of death due to shorter range.

Also, melee assassins like talon can't even burst down mages anymore due to the cost changes of Rod of ages and the like.