Though I feel for you and you have clearly expressed your knowledge and passion on the topic, I think giving the player a window to directly influence the selection of Pope (a la Ck2's "College of Cardinals", but you probably have your own "a b c d e f g are all wrong" speech about that mechanic) is one of the very low bars I have left regarding the "ok, considering engine limitations, this is a good enough Catholic Church, now is the time CK3 should move on to add East Asia" state of mind I possess.
Chances are they can always return back to flesh out religion more. At the moment even orthodoxy is bland in details as well, and this applies to all other religions.
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