... considering that every Chief Justice since the act of Congress that created it in 1978 has been a conservative (Republican), that may tell you something about the mindset of the FISC. It's certainly not a place to find diverse opinions.
So in your mental map of the universe you wouldn't find a justice appointed by a Republican president voting for something like
If the court found it legal before what would have changed? Nothing. Easy decision for them.
You should probably look into the question of the court forcing the Justice Department to alter applications for warrants. That is far more common than outright rejection. Applications for those warrants are inches thick. Do you think they like to redo them? Do you think they'll just slap some nonsense together just to see if they can slip by? If you think that you probably don't have any insight into the legal system, or the professionalism of judges and lawyers as officers of the court. Why would those jobs be highly competitive and credentialed if you can just slap some nonsense crap together and get by?