Given that elephants are known to need to forage as much as 22 hours a day to find enough food, and sauropods were much bigger than elephants (apparently because they *had* to be) -- it seems doubtful that *anything* outweighed an increase in absolute browsing capacity, in terms of evolutionary advantage accruing to certain morphological traits.
No. Elephants chew. Sauropods couldn't.If you know a way to test whether food intake rate was a limiting factor for sauropods, please tell.