They disagree on a lot of things, that is true, but the one thing they all seem to agree upon (except for Austrian economists) is that the economy can be effectively modelled and that effective policy prescriptions can be derived from said statistical models. It is a supremely complex system and it is the pretence of knowledge (in the words of Hayek) to believe that you can use monetary policy to command it, much less policies based upon empirical models which are as you say constantly bickered and debated about.
Furthermore, the Fed is not exceedingly transparent - audits of its operations and its meeting minutes are classified and are not open to public review, as is the case with most central banks in the world. I know because I've tried to ask for copies of open market operation details from my central bank (the Swedish Riksbank) but was denied as they are classified by law (which is incredibly unusual for a society where other government agencies publish everything, including income tax returns).
Fed Audited Financial Statements: https://www.federalreserve.gov/aboutthefed/audited-annual-fi...
I’m sorry that your Swedish central bank is classified, since, based on your worldview, there are presumably a bunch of Swedish economists working there behind closed doors to screw you over.
https://www.federalreserve.gov/aboutthefed/boardmeetings/mee...
"Effective March 15, 2020, the meeting was closed to public observation by Order of the Board of Governors1 because the matters fall under exemption(s) 9(A)(i) of the Government in the Sunshine Act (5 U.S.C. Section 552b(c)), and it was determined that the public interest did not require opening the meeting."
This seems to be the case for almost all of their meetings.
From your own link, verbatim:
"Items considered in closed session include primarily
- Bank and bank holding company supervisory matters, discussions of which generally disclose information from bank examination reports or commercial and financial information obtained in confidence by the Board - Monetary policy and other matters whose premature release could be used in financial speculation - Personnel matters."
Not very nebulous, eh?