Simplicity? A revolver?
You are kidding right? Mechanically a revolver is a far more complex contraption than even the simplest of autos. When you pull the trigger on a revolver in DA mode something like 200 individual operations are performed by the internal components. The biggest advantage to a wheelgun is clearing a FTF usually involves no more than pulling the trigger again.
Slower reloads, lower round capacity, complexity is not a winner in my book.