Re:different rules about the expedition cards - please take note of!!!!
Well, Arthur, I disagree with your disagreement

. I, too, enjoyed playing with the Rio rules. It was, in fact, key to my victory in the couple of Goa games that I actually won. I'm not entirely sure that the original rule will in any way hamper those people who most carefully track the expedition discard pile, but of course if the deck is newly shuffled when you start your fishing expedition (or tiger, or tree, or whatever) then you may be injured by this sequencing. In the meantime, this "change" forces people to play the auctions much more judiciously, in my completely non-humble opinion.
The principle argument in favor of pre-draw downsizing that I see is this: Why should you be allowed to bank actions? If you have cards you don't want to play, but are holding either because you don't want others to play them or because you are trying to hang onto a set, why should you continue to get additional utility from card draws without either spending the actions required to increase your hand limit, or giving up some of the banked utility that you've already obtained? I think it's deeply ingrained in many of us that drawing and playing/discarding down to a hand limit is standard operating procedure, but in a situation like Goa, where the cards have dual purposes, it makes perfect sense to restrict their convenience. I really despise having to ignore English language rules in favor of the original rules, but this isn't the first time it has happened, and undoubtedly will not be the last.
I agree with your comment at the outset--the game is excellent AND well conceived, and I trust Herr Dorn's opinion as regards the expedition cards.
With regard to your strategy comment: It's entirely dependent upon which cards you currently hold. If you're holding them, it's because either they form a set you want, or you haven't needed the action they provide. Just because you want to draw more for some reason doesn't automatically make the ones you are holding any more playable. If you have a hand full of "A" cards, none of which do jack diddly for you, then discarding is strategically just as viable as trying to force yourself to play some.