Your citation includes this declassified FISA Court memo:
https://www.dni.gov/files/documents/icotr/51117/2016_Cert_FISC_Memo_Opin_Order_Apr_2017.pdfIt's heavily redacted, but the gist seems to be that the NSA warned the FBI/DOJ that they had been breaching the rules about surveilling US citizens, giving them a chance to self-report to FISA Court. Which they did, claiming it was administrative error that would be corrected. The FISA Court seemingly refused to accept bland assurances and wanted to satisfy itself that it could not recur. Which is a great big credibility tick for those judges. I wonder what they're thinking now that the Investigation Committee memos are being released. Administrative lapse, or abuse? As your citation notes, the Court has no power to accuse or indict, but disquiet from that quarter makes it difficult not to appoint a special counsel IMHO.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
