I think people should stop trying to listen to the challanger/diamonds streamers about counters, because they get that conclusion according to some play styles and under certain circumdtances using certain masteries and runes. Any champ can win against another one, it all goes on the player's skills and how prepared is your enemy to counter your strategy.
Same applies to the idiots that look at boxbox getting 30 or 40 kills with riven and then they go and try to simulate their playstyle. That just won't work.
Yeah you can get tips and stuff from their style, useful tricks and whatnot. But copy their style to use the champion? Naaahhh each person develops their own style and build, if you try to copy someone else's is just gonna end terribly bad.
Frankly, it's not about copying a style: I think it's more about not having enough experience with a champion and how to react to developements
An example
Let's say that I'm playing Talon mid and I go back for the first time with something like 1550 gold
Now, I have to spend all this gold. It can go generally in many ways, but here are 3 possibilities:
-If opponent is an aggressive AP mage against which you have trouble, you usually get an Hexdrinker, some pots and if their jungler is good a ward or 2
-If opponent is a fighter/tanky champion, you go with a Brutalizer, some pots and depending on the situation boots (if I didn't buy them before) or wards
-If opponent can be killed, I get a B.F. Sword so that I can kill him and try to start snowballing
However, these aren't the only possibilities: if I am against Ziggs, I prioritize mobility more than dmg. Or, if one of their lanes is in disadvantage (bot or top), I get some Mobility Boots to help snowball and get assist/kill gold
I know all this, however, because I spent so many matches playing with talon mid (he's the first champion I ever bought) that I can picture, thanks to my experience, the right possibilities and reactions
Now, when a player tries to copy a style, it works only if the match is 100% the same as the match he saw. Otherwise, he ends up trying to build AP/AD instead of armor/health while in lane with a 4/0 Yasuo (which is a bad thing for those who do not know it), because he has no experience on what to do when behind, thing that instead the one who he's copying already witnessed over and over and over again so that he could do that "perfect match" which inspired people
It's something similar to what I said about the last Nemesis collab on your clan page about animation and inspiration