Prior to this, Apple’s SVP of Worldwide Marketing Phil Schiller explained why a 32GB MacBook Pro option was not offered, citing battery as one of the reasons. Now in another email that Schiller replied to developer Ben Slaney (via MacRumors), having the ability to support 32GB of RAM would also require a compromise on the design of the logic board.
According to Schiller’s email to Slaney, “The MacBook Pro uses 16GB of very fast LPDDR memory, up to 2133MHz. To support 32GB of memory would require using DDR memory that is not low power and also require a different design of the logic board which might reduce space for batteries. Both factors would reduce battery life.”
Ultimately it seems that this boils down to battery life. That being said if you absolutely need 32GB of RAM, KGI Securities analyst Ming-Chi Kuo had previously predicted that in 2017, we can expect cheaper MacBook Pros and also a 32GB option, so maybe you’ll want to hold off until then.