The people who think the rejoinings were actually justified are an extreme minority as far as I've noticed.

You can argue the Sundering was wrong, but at this point it's simply the way the world is now and it's unlikely there's any way it could be reversed without catastrophic consequences...nor is there really any practical reason for doing so at this point as mankind has been irrevocably changed for better and worse and the world becoming whole again isn't going to just magically fix that.

It would actually be liable to make things worse in the long run as you'd potentially have people as powerful as the Ancients being the norm, but without their moral compass and unity to prevent strife and we already saw how badly Hermes on his own was able to mess things up without even really intending to originally.