Apparently, the main reason Samsung didn't include a microSD slot in the Samsung Galaxy S6 series, but they have in the S7 series was basically a technical limitation that they had not been able to iron out to their satisfaction with that device. Samsung exec, Kyle Brown, recently spilled the beans on this subject.
Brown shared that because the Galaxy S6 series was the first device in which Samsung used their brand new super-fast UFS 2.0 memory, Samsung engineers were concerned that a microSD slot would slow down the over-all performance of the Galaxy S6 because the data would be read slower. They were not able to find a way to marry the two technologies before they needed to launch the phone, so they opted to push forward with the device sans the microSD slot.
Since that time, and since the new platform has been perfected, Sammy's engineers were able to overcome the technical hurdles and get the performance ratio between the microSD slot and their faster memory architecture to cooperate better. Thus, they were able to bring back the storage feature in the new Galaxy S7 series. What do you folks think? Does this explanation sound plausible, or just an excuse?
Don't forget to drop by our dedicated Samsung Galaxy S7 series section for further discussion: Samsung Galaxy S7 & S7 Edge
Source: TechRadar