Pixel binning and a properly-implemented sRAW render all arguments of file size issue moot.
Not only can it reduce file size to that of a 12 or 24MP file, but, unlike a native 12 or 24MP file, a properly-binned file (i.e. downsampled from all 48MP, not just using every second pixel) also eliminates colour aliasing, all but eliminates moire and greatly reduces lateral CA.