When the sword is charged up and blue, it becomes extra durable so you can use it significantly more often before it powers down. You are right though that if it had the same durability as when it wasn't blue than the frequency of it breaking would help counteract the benefit of it being a permanent 60 damage 1H weapon/make the weapon situational.
I see, I wasn't aware of that. I still don't think "overpowered" is a criticism that makes sense in this context though. For one, there are more powerful weapons in the game (at least I'm pretty sure there is, though correct me if I'm wrong, it's been a week or two since I played last), and since it does eventually need to be recharged still, that gives players a reason to use their other weapons - even when the sword is fully charged - because why would you use it to knock down trees or bat around some moblins when you could use one of the many lower tier weapons you've got?
And given BotW's overall structure I don't think it will make that much of a difference. It will look cool being all glowy though!
Edited by Migokalle, 02 May 2017 - 09:45 AM.