I spoke to a Samsung rep at Best Buy and he told me Samsung listens to its customers people complained about the material it was made of, so they changed it to premium material. people complain about the speaker sounding bad and the flap on the battery charger breaking off so they didn't do IP 67 water resistance. People complain about the batteries swelling up and having problems for years so Samsung manufactured their own high quality battery and locked it in so we wouldn't have those problems.
Bottom line you can't have everything guys it's give or take for some things, but I'm assuming Samsung will listen and there will at least be in SD card slot in the S7 or maybe even in the S6 Active.
Posted via the Android Central App on my Galaxy S5