Do you believe that there is no role / need whatsoever for a court in the United States that needs to hear confidential matters having to do with law enforcement, where to reveal it to the subject would compromise the investigation?
If you do believe there is the role for such a court, then the question is not whether it should exist, but how well it is overseen / checked, and what mechanisms there are to make sure it operates on correct information and has an advocate for the parties that are not allowed to participate in its decisions.
If you believe that there is never a need for law enforcement decisions to be made that cannot be revealed to the accused party, then that is a separate (and in my opinion, impractical/unreal) point. We might as well ban judge-issued search warrants unless the person whose property is being searched gets a chance to hear the evidence and object.