I didn't claim it was a great design, just that it was a possible direction that Blizzard is designing from. The synergy between Destro and Aff's mastery bonuses and GoSac is a whole 'nother problem to deal with. Unfortunately there isn't really an easy way to solve that issue without adding on a pet damage component to both spec's masteries to make the stat weights between different grimoires closer to neutral, which would mean a whole lot of damage balance headaches to deal with.