My issue is that the exceptions to the excluded words are arbitrary. If you choose a particular spelling (especially different romanizations of Chinese words) of a particular foreign word, there's no saying whether or not it will be in the Scrabble dictionary. Some abbreviations are in the Scrabble dictionary, but not all of them. And so on...
My point is that this is a problem with dictionaries in general, not simply the Scrabble dictionary. The Scrabble dictionary doesn't exist in a vacuum, it's compiled from real world source dictionaries. Those dictionaries (which are largely descriptive) have lexicographers and other academics who decide which romanizations to include based on what exists in actual usage. I mean SOOSHEE is a romanization of the Japanese "sushi", but its not in English dictionaries because no one uses it. But people do use both QAT and KHAT when referring to North African drug usage.
It's the arbitrary nature of the special "allowed" exceptions that I dislike about the Scrabble dictionary. The Scrabble dictionary introduces the "lawyer games" by making the rules arcane instead of simple and straightforward.
I don't see how it invites lawyering at all. It's a concrete list of allowed words. Either a word is in there or it's not. I'd venture that played to the rules in the box, and with an official Scrabble dictionary, it's one of the least amibigious/rules lawyery board games on the market.
I guess I don't see how you think anything is made simple and straightforward by using a "real" dictionary as you originally posted. Either that dictionary will be so comprehensive that it will frustrate you with lots of romanizations, or it will be so abridged that you'll be frustrated when you play some word that is very common in your field of study but perhaps rare in general discourse, and you find it's not valid because it was left out to keep the page count down.