To be perfectly honest with you, I think making Superman and Zod as clearly near invulnerable as they were was a stroke of genius, intentionally or unintentionally. And I'm not saying that because I'm all about Superman being crazy powerful. I GREATLY enjoyed the Superman vs Lobo fight in American Alien specifically because of the relatively modest power showing, and I could've read about T-shirt and jeans Superman punching tanks forever.
But, in the express interest of doing something new and fresh with the idea of really strong guys hitting each other; I think adding in the wrinkle that they are indeed near invulnerable in a way that we haven't ever really seen in superhero movies, but they're still operating under humanoid instincts of self-preservationist and fight or flight because for both--in their own unique ways--each hit given and each hit received was uncharted and terrifying territory is a fascinating and ambitious idea. There's something fascinating about putting characters of that power in a legitimate state of thinking "is this gonna be the one that kills?" The late Darwyn Cooke played with this idea to great effect in his
Superman: Confidential run. Key points being here
http://images.tcj.com/2016/05/Cooke-afraid.jpg and here
https://pbs.twimg.com/media/DdfLJM9V4AEFbkj.jpg
That said, I don't think Snyder's version really captured it in a way that it could and maybe should have. Greater emphasis should've been placed on the mind-blowing prospect of two Supermen deciding to see if they can hurt the other, rather than opting for the Smallville fight in full or the fight with the tentacled world engine. We should've all be waiting there with baited breath at the prospect seeing two Kryptonians come to legit blow on a world made of paper. But instead when Zod is still around at the end for some reason a good portion of us were like "what? Still?" Given more time and build up we could've gotten in Clark's head regarding the prospect of actually punching a person as hard as he's physically able, or getting hit by someone who hits that hard. Finding a way to kill the other could've, and maybe should've, been almost a semi-puzzle in some ways.
But these sort of explorations maybe don't lend themselves to characters that have to function and realistically leave a job other characters. If this whole thing blows over and WB keeps to the idea that moving forward everything is going to be unconnected until it suits them, then I'd like to see these sort of unique explorations of power mixing with humanity that Superman basically invented. Sorry for the long winded reply. It's just something I've been mulling over.