I take it you have already checked pedals,seat rails,seatpost -carbon on carbon-( which was my clicking issue while pedaling outside,carbon paste fixed.) crank/BB interface etc.
A1. only after I checked all the “easy to do” would I attack a press fit, mine fortunately is threaded and easily checked and wasn’t it
A2. I have bottom brackets with over15K miles and still spin but a bad bearing is always possible
A3 not as much an advantage in say an F1 car no sure it is really measurable in our applications.
A4 a threaded conversion ( which is what you are really dishing the extra Benjamin for not the bearing quality ) will be easier to check if a “tick or creak” comes back, and it will at some point.
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