Yeah, some people seem to be too focused on metagaming rather than just enjoying the game and they won't rest until everything is perfect. It's a bad attitude when playing a game, or living a life...
However... overpowered skills/talents are a problem indeed when you want the game to be challenging. Consider this example, I like this specific skill, I think it fits the concept of my character and I want to utilize this skill whenever possible. But what if it makes the game too easy? I just don't use it? It's very reasonable wanting it to be more balanced.
So... while I understand what you are saying and agree with you on some points, I would say game balancing is not completely unnecessary.