Their "choice" is basically this - "balancing is too hard and it's unclear how good is good enough so we won't be spending much time on that". That's OK with me. But it's important to understand what that "choice" is. It's not "we are watching it and the balance is fine". It's what I said - "nobody knows how good is good enough so we won't bother".
If your position is that card games are inherently imbalanced like that and that no card game with hundreds of cards can be balanced better than HS, then I don't think this is the case at all, but perhaps you'd better run that idea by veterans of other card games who also play HS, because I am not feeling qualified on that front (the reasons I think you are wrong are different).