I'd just like more freewheeling stuff. Something that sounded like it wasn't pored over incessantly until all the flaws and features were hammered out of it. Something that captured some magic and they just let it stand (like Moment of Surrender or most everything released before 1997).
I mean... Achtung Baby was pored over and hammered into place more than any other U2 album. It may not have taken as much time, as they didn't have as much going on back then outside of the band. But yea. They've always operated like this.