As a somewhat secretive court, I presume that 'me' as a citizen, could not just walk in and listen. And I presume it is not open to the press. So, just who would attend such hearings in the first place? I presume Carter Page would be out, as he is the subject (ie, target) of this application. Is it open to federal judges? Sinators? Congresscritters?
You are correct that FISA Court proceedings are held in secret. Secret hearings are not the concern.
The concern is that the DOJ has admitted that the FISA Court Judges rarely question the DOJ/FBI on the veracity of their applications to SPY on American Citizens.