For me, the presence of the other rough drafts (or, at least, alternative options; they're generally much more advanced than "rough draft", but were never meant to be part of a monolithic ruleset that was centrally selected. They shouldn't be compared to that and thought of as "rough drafts", in consequence, I think) is the beauty of RM2. I apparently don't like the same choice of options others do, and RM2 + companions gives me the ability to pick and mix (while, as it turns out, preferring the base game in any case over the particular choices that were made for the next version).
Game balance, inevitably, is trickier and individually achieved, in that system.