Upcoming nerfs on Vayne and Courage of the Colossus Master?

So i was browsing through PBE forums and came across some posts claiming that Vayne is too overpowered so she is required to be nerfed. Additional pointer was that she has a strong early game laning phase furthermore in late game with the critical build she pretty much melts tanks and can sweep the whole team. I'd like to point out that from countless videos i have watched, Vayne definitely does not have a strong early laning phase. In fact she struggles in early laning phase and she is highly dependent on a good support in order to lane properly. Champions like Caitlyn or Draven are common counters to Vayne since one outranges her in poke and Draven is an annoyance to lane against with constant strong pokes with Whirling Axes[Q]. Also it is pretty obvious you can opt for cc train to stunlock her and she wouldn't be able to lift a finger. Vayne is a fairly hard champion to play as it requires proper positioning to properly utilize her Condemn[E] and what more if she is against a Braum support, Braums [E] can easily nullifiy her damage output and with Concussive Stacks[passive] and follow up from adc, she gets easily stunned and melted. Also due to changes in previous patches, cleanse or Quicksilver Sash no longer cleanses Zed's Death Mark[R] so a Zed is likely to snowball her easily at any point of the game. There are lots of champion over the time where people complained about them being too overpowered and so on but were all of them necessary? I'd like people to reconsider whether it's a legit imbalance of champions or simply a rant by salty players who can't seem to figure out how to counterpick or work out a proper solution to take down certain champions[especially true in low elo]. A few rants in common i have heard trying to justify how overpowered a champion is often includes Jax, Master Yi, Yasuo and so on. Yet all the same there were nothing done to change Jax's kit nor Master YI. There were some nerfs done on Yasuo but he still remained a fairly overpowered champion. Anyone who can play a champion in a godlike fashion doesn't necessary mean that the champion is overpowered. It's simply due to the fact that you aren't good enough or that the team needs to learn to work together. League of Legends is a game that requires co-operation whether you like it or not. Unless you are THAT GOOD, it ain't League of SOLO.

Next up it's on the new mastery in the defense tree. I do agree it is a tad bit overpowered but only a small reduction in %scaling should be done or none at all. With all the new assassin meta and items, reworked champions are mostly snowballing so hard that building tank seems so pointless when it ends up getting melted easily. Furthermore the condition for a champion to use this mastery requires it to possess Hard CC[Stun,Knockup and etc]. So not all champions can utilize this. If assassins are already that overpowered why nerf this little consolation Riot has to offer tank players? I remember playing a game where a Ryze top with Frozen Heart easily dived and killed by a Talon with only a duskblade. Now this calls for the question, is that balanced?

I am sorry for the long rant and i know that some of my theory might be flawed but i just want to point out that not everything has to change just because of some players' salty rant. I may not be a really good player myself but theory-wise i might be better than most thanks to countless of coaching videos and streams of pro-players i have watched. Another thing i want to mention is regarding meta-slave. Sometimes just because someone wanted to try something different[Normal Games, not Ranked] don't condemn them for it by saying it's not in the current meta or that it's trolling. Mind you any creative builds had to come from somewhere and it's not only limited to pro-players. Even low tier players might have creative ways to play certain champion and it's one of the few things that makes the game fun so stop abusing players wanting to try some new things.

Also before some haters start jeering at me for my rank/mmr or KDA ratio i would like to point out that i am playing with a base ping of 220-280 depending on time of the day and a laptop that suffers from random fps drops. Else i would perform marginally better in most games.