Personally as a gamer SD cards suck. Even if you can install the whole game and the data to the card, it will take twice as long to load each level and already such files are huge and take forever to load. SD cards are great for music and movies/pics. But not for anything else.
Like what was already said, SD cards are great for the low to mid range phones that don't have too much on board storage. But for a flagship, I don't want to be locked down to only some minimum rom that I can't install more than what is being sold. A good example is the LG G4. It's a great phone that even has an SD card slot. But that SD slot won't help me when I run out of storage for my apps that are huge. And because you can't buy a G4 with anything larger than 32gb, I'm limited in options as to just what I can install.
If this was 2013, then yes I agree that 32gb is enough storage for even the craziest data hog out there. But this is 2015, and with apps that are getting larger and games that are getting huge (with save files sometimes just as big), I feel that 32gb is not enough. Just think, with 4k video recording and a camera that takes 16mp pictures, a simple holiday like Christmas can lead to you filling up 5gb of storage real fast.
(on some phones 4k video and taking pictures rapidly won't even save to the card so the built in storage can fill up fast.)
Sure, you'll pay less if you use an SD card. But you'll also get less in return.
If anything IMHO, Samsung did what others have failed to do by giving us storage options that nobody but Apple has done.
Even in the past when the base model for Samsung Galaxy S2/3/4/5 was only 16gb, it would take you a month to get the 32gb model and it was almost impossible to buy the 64gb phone. To me this means that with the S6, Samsung not only made history, but was a huge success in being able to sell not only the base model of 32gb (already a nice increase from the past), but also sell the 64gb model during prerelease. The 128gb model also took only about a week delay or so, most likely due to high demand and with the carriers not realising how many people wanted it.
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