It should be noted that Hawaii was included in the earlier editions. Presumably the creation of the ABA area caused it to be jettisoned in the first place.
Why bother including all of those Asian strays? Most birders are never going to visit Gambell or the Pribiloffs, so clearly a waste of space.
Hell why bother including Alaska at all? Most of that state, including the places with most of the specialities, are more difficult and expensive than most of Hawaii. A trip to Attu nowadays costs more than hitting up Oahu, Hawaii, Kauai, and Maui. And how well you do is ENTIRELY dependent on weather conditions. Wrong direction of wind and zero chance at Asian vagrants. At least I know the Nene and I'iwi are actually going to be present if I target them.
Regarding the extreme rarities, the European 'Collins' guide that we all use, has two pages dedicated to North American passerines. I suppose it depends on the frequncy of those rarities as to how useful they might be. We have a few places like the Scilly Isles and Shetland, where those pages could be useful but we're at a slightly smaller scale here.