I'm ready to embrace all the fantastical elements
Bruce Wayne is at the peak of human conditioning in all facets, I'm ready to see that guy on screen.
The peak of human conditioning isn´t enough to fight super powered enemies without dying instantly.
Batman can only be cleverly explored fighting humans and having an hard time doing it.
Oh, and my ideal Batman isn´t at the peak of human conditioning, because that´s simply not possible for someone like him.
First off all, in a lot of stories, he is too old. Anyone above 30 can´t be at the peak of anything. Your body is already falling apart.
He doesn´t have an healthy lifestyle. This is pretty obvious for anyone who reads comics. He doesn´t sleep enough, he is constantly getting injured and doesn´t give time to his body to heal.
He gets punched in the head all the time. If he is a human, he gets brain damage. And if he gets brain damage, he can´t really continue to be super smart.
He spends a good part of his time fighting crime, so he doesn´t have time to train. Anyone who knows anything about sports and human body knows that, to be at your best, you need to train very hard, several hours a day, everyday. For any man to even come close to do what Batman does, he would have to train like an olympian on a daily basis. And if you´re a human, you can´t do that. Fact.
So, Batman fighting humans the way he does is already unrealistic enough, but people still feel he should fight superhumans. Why not just give Batman super powers? Because that´s what he has, if he can actually do that.
To write a clever story about Batman you need to take into account all the weaknesses a real human would show under the circumstances he lives in. You need to make him fragile, beatable, conflicted. He needs to live in his world, where he is fighting enemies who have real weaknesses like him. That´s the real appeal of Batman: His weaknesses. If you take that away from him and make him capable of achieving the same as Superman...then well...he is Superman, right? He is basically just another god with a slightly different modus operandi.
There are so many amazing stories you can tell about Batman without going "fantastical". Too bad studios and people aren´t interested in it. You always dumb things down when you add too many fantastical elements.
Oh, and remember: If we consider, movies, comics, tv shows and videogames, we´ve seen Batman portrayed way more times in a fantastical universe than in a grounded universe. That´s why i think it would be cool to explore something different.