So by your definition Viy was fine as it was correct? There was no need for a nerf....players should have just changed their strategy right? That's what happens when a new card is added. Do you see the flaw in that argument? At least pretend to be objective.
I don't see how you interpret balancing a card to
"Are you saying you should be able to build a deck that is 100% effective against all opponents"... My argument, is no one card should force players into playing a single leader ability. If everyone decides to play Arachas swarm for example because all the other leaders give Anna too much power how is that conducive to a healthy game? That's partly why you're see less Carapace and more Swarm now. And Carapace was previously nerfed, your argument that all the other leaders were too strong and that's the issue really doesn't hold up. Damien had the very same issue...the only difference between the two is Anna gives you the opponents ability but it's still a second go at a leader ability...there are countless examples why he needed to be nerfed and it's no different for Anna so I can only describe your response as very bizarre.
And of course the irony of this statement
"Are you saying you should be able to build a deck that is 100% effective against all opponents" when we're talking about the only faction that has every tool at the cheapest cost to answer any deck in the entire game. Is that not what NG players were boasting about during the lockdown meta...which is why lockdown had to be nerfed. Oh yes, because they were able to answer any deck and forced players into playing only specific leaders