The link you posted cites and links the FDA meeting they had for public discussion. It was almost a 9 hour meeting (which they have a youtube recording of), to say that wasn't transparent seems... inaccurate. Did you not read through the citations from your own source?
>Interested persons may present data, information, or views, orally or in writing, on issues pending before the committee.
https://www.fda.gov/advisory-committees/advisory-committee-c...
"FDA set to grant full approval to Pfizer vaccine without public discussion of data": https://www.bmj.com/content/374/bmj.n2086?s=09
Expecting the public to have confidence in these vaccines is demanding a level of subservience and blind faith that most reasonable people are unwilling to provide.