State of armor items (+some juggernauts suggestions) (edit; also nerf vayne)

I feel like the current state of armor items is pretty bad. It's cool and all that there are more of them, but each seem pretty underwhelming. Before the defensive item overhaul you used to "need" 2 armor items and 2 mr items to be hard to kill (given no one has snowballed, enemy team is balanced with AD/AP), but while the mr item changes didnt revert the need for 2 items, now you need 3 armor items to be as (ok, slightly more) tanky as you were before. And the nerf to thornmail in perticular made it pretty difficult to deal with a fed adc. Im just gonna use vayne as an example - before the overhaul it was pretty straight forward what item you needed to deal with her; thornmail. She would still become a monster late game, when she had the crit to back up her lifesteal and some mr to counter the thornmail dmg, but that is kinda her thing; she has a slightly below early laning phase, but a ridiculously strong late game, and that was fine. The problem is that if she went even or better in lane, she would still have a pretty decent mid game, hence the thornmail buy before she can get crit and mr. Kinda the same thing goes for all other late game-focused adcs (generally the ones who rely on autos). Now you get.. dead mans plate(?) in pretty much every scenario, but once the movement buff is gone its still not as good as the old thornmail, because you will run out of bonus movespeed, but the enemy team will (often) not run out of ways to peel you; almost every champion has some way to hinder you. and a vayne with a bork will take a nr2 on your 50 armor. The same for ad casters; you used to get randuins, because it gives a lot of health and armor. now you get.. dead mans plate(?) because it is still the best option. I understand the need for some changes with the introduction of juggernauts; you cant have someone that will kill you whether he reaches you or not, but maybe it would be a good idea to tie their damage to health? and then reverting/changing some of the nerfs to armor items, giving some of them more armor/giving them more defined roles, so you would as a juggernaut have to choose between dealing tons of damage and still being pretty tanky (hp-based), or being really tanky and still dealing a good amount of damage (armor based). Also keep in mind that the solidified tanks/juggernauts also have some form of dmg reduction (or similar) in their kit (maokai ult, volibear passive, darius heal, garen w), but the changes especially hurts the ones that dont. Like how elise is commonly played, eve, amumu (has a much weaker dmg red. so im counting him in here). I know that they have tools in their kit that makes them unique, but since there is RG in the game and talisman got buffed, there are some really clear ways to make their lives miserable. for the sake of this example im disregarding mr/magic dmg, cus i think that the changes were really good and there are ways to both being tanky and killing tanky people magic damage wise. i dont really have any specific suggestions to numbers on champs/items, but i do hope you (riot) consider some of what i am writing here. Thanks EDIT: also nerf vayne to the ground (or make some changes), im sick of having her in every other game and she is OP (like i said in my example above; the one stand-alone item counter to her mid game was destroyed. sorry; demolished)