Adding KD also served to add a top three player to a 73 win team, and allow more room for steph, who is indeed one of the best three point shooters of all-time, to work with the crazy range that he has. You can't just ignore the fact that the Warriors were masterfully constructed. Curry undoubtedly benefits from having that roster. So when you're talking 'Most Valuable' you have to respect a guy doing so much with so much less.
Again, we are acknowledging that he's floating around the perimiter on literally one of the best constructed NBA rosters of all-time, right? We can't give Steph all this credit and not be realistic about the fact that Draymond's all-time great role playing, KD's all-time great everything and Klay's all-time great shooting makes his job a lot easier than someone like James Harden, right?