If the FBI wants a warrant, they should have to go through a process where they are held accountable to the public and afterwards the accused can challenge the validity of the warrant. End of story. That is how a free society works. Plenty of people go through the normal warrant process without hearing about their warrant (so evidence is not destroyed) and then get a chance to challenge it after the fact. The FISA courts close off any chance to challenge your warrant. I think the bare minimum for an enforcement body to get a warrant is to reveal the information being used to get the warrant to the party being served the warrant. The fact that the FISA court does not have this requirement makes a mockery of democracy.
You may not like it. It may make your job inconvenient (if you happen to be a fed). I don't care. As the person holding the gun to the peoples' head, you should have to do a little extra paperwork if you want to pull the trigger.