superchunk on 12 December 2011
That's a horrible answer and quite wrong.
They could have accomplished this with 16GB internal flash built it and then allowed a SD card slot for expanding. Could of easily kept security and other issues tied to the internal memory while expansion was utilized for other media or raw binary game data.
Real answer is they knew it would decrease cost to manufacture Vita as well as dramatically increase revenue due to accessory sales of overpriced proprietary SD card.
