I think there is a theoretical limit to how good a team can get offensively, and GSW was at that point last year. Adding more fire power to that team, all while sacrificing defense might come around to bite them this season.
If you look at GSW team through a chemistry perspective, last season they were a strain-less cyclohexane ring, and this off season they added yet another methyl to the ring, thus creating strain. (currently studying for Ogro LOL)