Which would be cool would be to have all the strengths equal in power.
Let’s take shaman and rogue (the arguably less powerful and most powerfull classes in the game history)
In an ideal world :
Shaman’s strength (board fill and enhancement) would be equally strong as Shaman card draw.
But it’s super difficult to adjust since shaman has not only board fill strength but also face blasts, and rogue has also tempo options and weapon mecanics.
So we would have to make that balanced as well.
And that’s just for 2 classes, but we have to balance every classes strength for 10 classes. And make sure their weaknesses are not too much of a burden.
Plus when we have a balance, we have to make sure we release new cards from time to time in order not to have a boring game.
Seems to difficult to me, that’s probably why they decide to make the game unbalanced in a controled way and to change the OP classes and the bad classes from time to time so people are happy.