It favors downvotes over upvotes, which I presume is what you mean by it attacks the power balance (i.e. it changes the power balance between upvotes and downvotes).
But I think this is a good change in that balance, because payouts to a post are "irreversible". Whereas if a post gets downvoted in a way that other stakeholders feel is unfair, a followup post can be made and stakeholders have a further chance to adjust the payout to the author "after the fact". In fact, we've seen this done before many times in the past, when the community decided that a downvoter was acting unfairly.
On the other hand, there's no way to reverse a payment once it's made, so last minute voting that results in a post payout that most people disagree with, can't be adjusted.
As a side note, downvoting doesn't decrease the amount of rewards paid out by Hive, it only distributes those rewards away from the downvoted post to other active posts and comments. I think this is worth mentioning, since I'm not sure how many people know this.